Sunday, January 24, 2010

What's the difference between a control, constant, dependent and an independent variable?

A single loop control system consists of an input and several outputs.





The ';input'; is an independent variable.





The ';outputs'; are all dependent, or controlled, variables.





There are no ';constant'; variables. Some constants are set for calibration purposes, in which case they are called ';parameters';, or ';parametric variables.';


,What's the difference between a control, constant, dependent and an independent variable?
In computer science and mathematics, a variable (sometimes called an object or identifier in computer science) is a symbolic representation used to denote a quantity or expression. In mathematics, a variable often represents an ';unknown'; quantity that has the potential to change; in computer science, it represents a place where a quantity can be stored. Variables are often contrasted with constants, which are known and unchanging.





Dependent and independent variables refer to values that change in relationship to each other. The dependent variables are those that are observed to change in response to the independent variables.





Controlled variables are also important to identify in experiments. They are the variables that are kept constant to prevent their influence on the effect of the independent variable on the dependent.


In summary:





The independent variable answers the question ';What do I change?';.


The dependent variables answer the question ';What do I observe?';.


The controlled variables answer the question ';What do I keep the same?';.
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  • Statistical studies in which researchers do not control variables of interest are?

    Statistical studies in which researchers do not control variables of interest are


    a. experimental studies


    b. uncontrolled experimental studies


    c. not of any value


    d. observational studies


    Data collected at the same, or approximately the same, point in time are


    a. time series data


    b. approximate time series data


    c. crossectional data


    d. approximate dataStatistical studies in which researchers do not control variables of interest are?
    The first one about controlling variables of interest is ';D'; - observational studies. In Observational Studies you have researchers sit and (imagine this!) ';observe'; what the subject of the experiment does and takes notes. They don't control anything! At the end, they write it all up in a long report. They don't manipulate anything.





    As for the second one, I'm sure it's not ';D.'; I've never heard of that before! I've never heard of ';B'; either. ';Cross - sectional'; is the way I think of ';C'; - split apart like that. You are looking ';across a section of data in time.'; That's just the way I memorized it. So I'm leaning towards ';C.';

    What is a controlled variable in a science project?

    A controlled variable is something that you can control yourself, for example if you are doing an expirement with measuring water, the controlled variable is the water, because you choose how much to use.

    Does anyone know what a control or variable is?

    it is for science fair and i need help with the control variable and analysisDoes anyone know what a control or variable is?
    Oddly enough, this actually can work in the math section of this website. . .





    Anyway, a control is something in an experiment which does not change through multiple trials (for example, in a study about how well a type of plant grows in a certain type of soil, the same type of plant will be used in each experiment with different types of soil; in that experiment, the control is the plant). A variable is whatever changes in an experiment through multiple trials (for example, in the aforementioned study on plant growth, the type of soil is the variable).





    Anyway, this is similar to something in math. . .variables change, and constants (controls) do not.Does anyone know what a control or variable is?
    The variable is what is changing and the control is what you have control over...





    so...i believe if you are trying to see what plant food works better then your controls would be:


    the seed, the pot, the soil, the amount of water...this is the same for each


    the variable would be the food...it is different in each
    In order to learn anything from an experiment, you should only change one thing at a time. The thing you change is called the ';variable';. The ';control'; is the thing you don't change, or a sample in your experiment with a result which you already know the outcome for. Only by comparing the variable results to the control results can you make a meaningful conclusion.





    For example, let's find out which liquids freeze in your household freezer. Your variable would be the material (orange juice, milk, cola, beer, vodka). You should keep all other factors the same (volume of liquid, shape of container, initial temperature of the liquid, location inside the freezer, time spent inside the freezer, etc.). Your control might be a sample where the liquid is water. Since you know the temperature at which water freezes, that gives you something to compare the other results to. You could determine which materials freeze faster than water, or do not freeze at all in your freezer. If you inspect your samples and the water is not frozen, you know to wait longer, or perhaps your freezer is not functioning properly.





    The control helps you determine if the experiment performed as designed. If the control doesn't produce the results you expect, you can't draw any conclusions from any of the variable samples.
    In science, you want to demonstrate the validity of a theory, or proposition. First you must state the theory. Then you must design an experiment to test that theory. A good experiment varies one factor, or condition, called the variable. If you have more than one variable, you will not be able to tell which one or ones are affecting the outcome.





    To make your experiment even better scientifically, you establish a control component, which is to say, you have the same elements and processes as the experiment, but you do not introduce the test variable (or any other variable, except time, if you can). That way, you show that only the variable affects the outcome of your experiment (if indeed it does so), and can measure how it does so.
    It is the aspect of the experiment that you change. When you change th value of the control variable, you get a change in the dependant variable. This way you can state that the control variable is important.

    Biology: What is a controlled variable,dependant,etc...?

    OKay, we have this assignment and I just want some help cause I am confused. Its 9th grade project: Here it goes...





    We have to design an experiment about Lung capacity and I already know what I want to do but the only problem is the critteria says:





    '; choose one controlled relevant variables and two test variables';





    what do those words mean?





    Thank youBiology: What is a controlled variable,dependant,etc...?
    Ask your teacher - it's what they're paid for.





    But seriously.





    In this case, a controlled variable is something that remains stable and unchanging. You haven't altered it in any way, and you will be comparing the test variables against it.





    The test variables here would be two different ways you could show different lung capacities (that's just an example I came up with).





    The bottom line is: Test variables are the ones you change or experiment with, while the controlled variable is the 'normal' one that you compare them with.





    Hope this helps, but please ask your teacher to clarify it - that's what he/she is there for!!





    Good luck :)

    What are independent variable, dependent variables and controlled variables?

    It is easier to understand by an example: You want to know how the volume of a gas varies with an increase of temperature. You conduct an experiment to heat a volume of gas, for example in a gas syringe, over a range of temperature:


    The independant variable is the temperature - this is what you are measuring the volume against.


    The dependant variable is the volume, it is dependant on the temperature.


    The control variable in this case is the gas pressure. Every time you measure the volume, you control (adjust) the pressure back to what it was when you started.

    Experimental Control and Variable?

    What is the difference of control and variable in a experimental?Experimental Control and Variable?
    The experimental control is just another way to say control set-up. Basically it is the set-up where the manipulated variable is not present or is a basis. (Like just plain water for growing plants)





    The Experimental variable is also known as the manipulated variable, and is the actual variable that you manipulate in your experiment. (Like 5% Fertilizer water vs 10% Fertilizer water for growing plants)Experimental Control and Variable?
    In any kind of experimental study, you need to first have a hypothesis, an expected experimental outcome or result. Next, you need to know what the variables are that influence your expected findings. Then, if possible, you want to be able to set your experiment up in such fashion that you can hold all of the variables constant except for the one that you are interested in. You then proceed to test each variable over a range of conditions while holding all other variables constant. You compare your findings with a ';control'; that is not tested under experimental conditions. In this way, you can compare your experimental data with a known standard in order to determine if your experimental findings fits with your expected results.





    From that, you can do some type of analysis of the data.
    You have 50 mice.


    You want to know if giving mice extra vitamins makes them live longer. Longer that what? Answer: Longer than mice that don't get extra vitamins.


    So in your experiment, you give 25 mice extra vitamins, and the other 25 mice eat a normal diet without extra vitamins. The first group is your variable group. This last group of 25 mice is your control group.
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  • What is my Dependent Variable, Independent Variable, and controlled variable?

    I'm doing a science fair project. My purpose is ';What burns faster-hardwood or softwood?'; to do this, i obviously bought hardwoods and softwoods and burned them. So what are my variables?What is my Dependent Variable, Independent Variable, and controlled variable?
    independent= type of wood


    dependent= time wood takes to burn


    controlled= im not quite sure. there aren't any other variables.What is my Dependent Variable, Independent Variable, and controlled variable?
    I think your variables are hardwood and softwood. Not sure if they're independent or dependent. ):


    And maybe your controlled variable is fire.


    Sorry if I'm wrong, I'm just giving my best guess.

    What are the dependant and independant variables, control group and constants?

    In biuret, starch, lipid and benedicts test. How can independant variable be manipulated?What are the dependant and independant variables, control group and constants?
    The independant variables are the variables that you control and the dependant variable are the variable that take place BECAUSE of the independant variables.


    The control group is a neutral group so you have a ';norm'; to base your experiement on. For example if you're testing a pill that contains hormones then you give one group the hormone pill and another group a placebo (sugar pill) and you don't tell the groups which one they're getting. That way you can see whether it's psychological or not.


    The constants are pretty much what stays constant.

    Biology- control/variable help?

    In biology when doing a lab is the control the substance that always stays the same and variable is the substance that changes?Biology- control/variable help?
    That is pretty much correct. For example, if you are studying the effect of a drug on metabolism, the experimental cells receive the drug dissolved in something (like water), and the control cells receive just the solvent without the drug.

    Science help-identify the dependant and controlled variable?

    10 potted plants are given fertalizer and another 10 potted plants are not give any fertilizer. All 20 plants are the same type and are all given the same amount of soil, water and light.





    what are the dependable and controlled variables in that?





    THANKS SO MUCH!Science help-identify the dependant and controlled variable?
    You should study the meaning of independent and dependent variables. The control usually refers to the independent variable and is not usually called the controlled but is called the independent variable.





    In science, math and statistics, when experiments are done; they refer to independent and dependent variables. A controlled variable refers to one that can be changed. In that case, the controlled variable can also be called the independent variable. The dependent variable would be the results of your experiment that are changed by changing your independent or controlled variable.





    In your experiment, the controlled or independent variable is the fertilizer. You have 10 potted plants with fertilizer and 10 potted plants without fertilizer. You have the ability to control the fertilizer, i.e. you put fertilizer in some plants and not in others.





    The dependent variable is the outcome or results of fertilized plants versus unfertilized plants. In other words, the results, depend totally on your controlled variable of putting fertilizer or not putting fertilizer. For example, fertilized plants will grow better than unfertilized. This result is dependent on the amount of fertilizer or it's dependent on the controlled or independent variable that you control.Science help-identify the dependant and controlled variable?
    soil, water, light - controlled


    fertilizer - dependent
    same type,s oil, water and light = controlled


    height plants grew to = dependent

    Science Fair help, Control Variable?

    I'm doing 7th grade science fair and need help!! My science fair is to find out which eyeliner is the most waterproof? ex. Maybelline, L'Oreal or Sephora?





    I want to find out what the control variable is for my science fair question. and if you could please explain really short what a control variable is because i kinda understand it, but not really :/





    lol thank you! 5 stars automatically for the best one :o)Science Fair help, Control Variable?
    Here's a good explanation of it. control variables are things that could vary, but you keep them under control...the ideal experiment has lots of control variables , one independent var., and one dependent var. Keep everything the same, change one thing, and observe changes in one other thing. The clever scientist will look ahead and 'guess' what things might change, and control them.

    What is my control variable?

    i am doing an experiment to see whether a tennis ball bounces higher on tarmac, concrete and grassWhat is my control variable?
    The two above answers are both right to a point. How about the energy that is starting the ball in motion? Should that also be a consistent throughout the tests?What is my control variable?
    and weather conditions.


    wind/air resistance, etc
    your control is the tennis ball as u will be using it in every experiment
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  • I need help recognizing the independent, dependent and control variables ?

    A clinical psychologist is interested in how heart rate us affected by viewing a violent film as opposed to a nonviolent film. (identify the variables)I need help recognizing the independent, dependent and control variables ?
    independent- films


    dependent -heart rate


    controlled- the person watching it

    In an exeriment, what is a control??or a controlled variable??

    it's a variable whose effect you try to remove. For instance, if I'm doing a study to see the effect of eating fruits and veggies on weight, I might control for exercise and overall calories consumed. these may also affect weight and they probably correlate with f%26amp;V consumption (people who eat more f%26amp;v prob eat fewer cals and exercise more), but it's not their impact i care about.In an exeriment, what is a control??or a controlled variable??
    A controlled variable is one that you want to change. Let's say you are doing an experiment comparing how often a dog sticks out its tongue at different temperature. The temperature would be the controlled variable. Everything else are called constant variable (cuz they should be kept constant).In an exeriment, what is a control??or a controlled variable??
    Constant and control are interchangable. It's one aspect of an experiment, with the variable being the other. All of the previous answers use examples of controls and variables. The dog is an easy one to understand. You always use the same dog (control/constant), but adjust room temp to see when it starts to pant (variable).
    The control variable is something that you control, but can alter to different values to take mesurements of the variable you intend to measure.





    Say you were measuring how resistance changes with temperature.


    You could alter the temperature using a heater, this would be the control variable. The measurement variable would be the resistance, which you would note for each value of temperature you set.

    What is the difference between a control group, independent variable...?

    Control group, independent variable, and experimental factor?What is the difference between a control group, independent variable...?
    independant variable is the one I control





    ur testing something about food and a dog, the amount of food / the type of food you give it is the independant variable








    control group is a group of individuals, involved in a experiment, who do not receive the treatment








    experimental factors are what influence the outcomeWhat is the difference between a control group, independent variable...?
    Idk i'm doing the same thing right now! i need help :(

    I'm doing a science fair project and I need a control and variable for my project.?

    I need a variable and control for this:





    My science project is about plant regeneration (please discuss about what you think).I'm doing a science fair project and I need a control and variable for my project.?
    for a variable you can cut some at an angle and some straight for control put all slalks cut in the same window at the same time with same water u could even use a 2nd variable of doing 2 angle and straight but giving one angle and straight more light than the other or do 3 and give the 3rd angle and stright less water but same amount of light i suggest using some ivy it is easier to growI'm doing a science fair project and I need a control and variable for my project.?
    Control would be placing the plants in the same location so they receive the same amount of light at the same room temperature and for the same amount of time.





    Variable would be how much water they receive and did/did not fertilize, or different levels of fertilization, or different compounds of fertilization.
    Control: A plant, left alone.


    Variable: A plant, with some lacerations on it.
    well the control could be how much sunlight and water they are givin the the variable would then be what type of soil was used or something like that

    I am doing a science fair project, and i need an independent variable, dependent variable, and control????????

    my question is ';which type of ice will melt first?'; i am using black food coloring, red food coloring, and salt. PLEASE HELP! what is my dependent variable, independent variable and control.I am doing a science fair project, and i need an independent variable, dependent variable, and control????????
    Independent variable: One that the researcher purposefully changes. In this case, the different types of ice are independent variables.





    Dependent variable: When the ice melts is your dependent variable. It is ';dependent'; on something that you are manipulating.





    Basically, the thing that you are changing is independent, and the thing that you are measuring is dependent.





    Control: A piece of ice with nothing added would be the best ';control'; here. In this case, you'd more be asking the question ';How do additives effect the rate of ice melting?'; Additionally, anything that you maintain the same throughout the experiment is another type of control--the size of each piece of ice, the starting temperature of each piece of ice, the temperature you expose the ice to in order to make it melt, the shape of each piece of ice. As a note, it would be a good idea to measure the temperature of the ice when it starts melting--it will be different for the control ice block from the ones with additives, especially the salt block.

    I'm doing a science fair project and I need a control and variable for my project.?

    I need a variable and control for this:





    My science project is about plant regeneration (please discuss about what you think).I'm doing a science fair project and I need a control and variable for my project.?
    for a variable you can cut some at an angle and some straight for control put all slalks cut in the same window at the same time with same water u could even use a 2nd variable of doing 2 angle and straight but giving one angle and straight more light than the other or do 3 and give the 3rd angle and stright less water but same amount of light i suggest using some ivy it is easier to growI'm doing a science fair project and I need a control and variable for my project.?
    Control would be placing the plants in the same location so they receive the same amount of light at the same room temperature and for the same amount of time.





    Variable would be how much water they receive and did/did not fertilize, or different levels of fertilization, or different compounds of fertilization.
    Control: A plant, left alone.


    Variable: A plant, with some lacerations on it.
    well the control could be how much sunlight and water they are givin the the variable would then be what type of soil was used or something like that
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  • I am doing a science fair project, and i need an independent variable, dependent variable, and control????????

    my question is ';which type of ice will melt first?'; i am using black food coloring, red food coloring, and salt. PLEASE HELP! what is my dependent variable, independent variable and control.I am doing a science fair project, and i need an independent variable, dependent variable, and control????????
    Independent variable: One that the researcher purposefully changes. In this case, the different types of ice are independent variables.





    Dependent variable: When the ice melts is your dependent variable. It is ';dependent'; on something that you are manipulating.





    Basically, the thing that you are changing is independent, and the thing that you are measuring is dependent.





    Control: A piece of ice with nothing added would be the best ';control'; here. In this case, you'd more be asking the question ';How do additives effect the rate of ice melting?'; Additionally, anything that you maintain the same throughout the experiment is another type of control--the size of each piece of ice, the starting temperature of each piece of ice, the temperature you expose the ice to in order to make it melt, the shape of each piece of ice. As a note, it would be a good idea to measure the temperature of the ice when it starts melting--it will be different for the control ice block from the ones with additives, especially the salt block.

    Which would be the control variable?

    starting temperature (100c on each test), times temperature was taken (every min for 10 mins), duration(10 mins for each test)


    are all these control variables


    ThanksWhich would be the control variable?
    Control and variable are opposites


    you usually vary two factors - the variables. Everything else is kept constant ( the control)Which would be the control variable?
    100 degrees Celsius is the boiling point of water, So I would be thinking as to how much of this liquid have you distilled in ten minutes.





    Could be that you are talking about metal, start at 100 degrees, what is the linear expansion of the metal.





    Could be you are talking about rocks, I could tell you, if I knew what we are talking about.





    The other variables are. What substance are we talking about? What is your heat source? If it is Electric, then is the heat constant? If it is gas, what type of gas are you using? Does the output of the Gas appliance remain constant?
    there should be 3:


    the temperature


    the time


    time temperature was taken.


    the amount of liquid should be there or it will be a unfair test

    In scientific terminology, what is a control, and what is a variable???

    I need help with my science fair project, have any websites I could refer to??In scientific terminology, what is a control, and what is a variable???
    A variable is a characteristic or condition that changes or has different values for different individuals.





    A control is to verify or regulate (a scientific experiment) by conducting a parallel experiment or by comparing with another standard.In scientific terminology, what is a control, and what is a variable???
    A Control group is the experimental group with the ';normal circumstances'; for whatever variable you are changing. A variable is what you change to do the experiment. For example, if you are testing what kind of dirt a certain plant grows best in, the kind of dirt and height of the plant are the variables. The height of the plant DEPENDS ON the kind of dirt. The height of the plant is called a DEPENDENT VARIABLE, and the kind of dirt is called an INDEPENDENT VARIABLE. You can use the ';X'; axis (across the bottom of a chart) to put the kinds of dirt, and the ';Y'; axis (up the side of the chart) to put the height the plants grow to.
    A variable is any measured characteristic or attribute that differs for different subjects. For example, if the weight of 30 subjects were measured, then weight would be a variable





    In the control experiment all factors, apart from the one under test, are exactly the same as in the test experiments, and all the same measurements are carried out





    for ideas try here http://www.all-science-fair-projects.com鈥?/a>

    UG help me please!!! what dose control & Variable! 80% of grade plz make it in dumb form xDDD?

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    Which is the variable and which is the control??? PLZ HELP DO NOT SKIP IMPORTANT DUE TOMORROW?

    i am doing a PROJECT ON POTATOES AND i want to know which is the variable and which is the control. there are 9 potatoes 3 i put in the microwave, 3 i put in the oven, and the last 3 i put on the stove in 1000 mL of water.Which is the variable and which is the control??? PLZ HELP DO NOT SKIP IMPORTANT DUE TOMORROW?
    variable is what ur changing to see how it affects the control


    in ur case it should be the method of heating


    the control is what stays the same, so the potato





    determining the variable and the control depends on what ur asking in the experiment....if u r asking what effect does heat have on the potato then its likely that the control is the potato (it stays the same) and the variable (thing that u are varying) is the method of heatingWhich is the variable and which is the control??? PLZ HELP DO NOT SKIP IMPORTANT DUE TOMORROW?
    the variable is the heat you place on the potatoes or where you place them


    the control is the number of potatoes

    What is a control group an independant varible dependent variable and everything else?

    Control group= the standard, what you compare your results to





    Independent variable= what you change in the experiment, what you are testing





    Dependent variable= what changes from altering the independent variable





    Example!





    In an experiment where you compare two plants, one that uses miracle-gro and one that doesn't





    Control: The plant that isn't using miracle-gro (something to compare the other results to)





    Independent variable: whether or not you put miracle-gro on or not (what you change betweenthe two variables)





    Dependent variable: Plant growth (what the independent variable changes)What is a control group an independant varible dependent variable and everything else?
    An independant variable is something that you are testing in your experiment, like added plant food or amount of water given to a plant. The control group is the group without the independant variable, like the group with no plant food. The dependant variable is a result of the independant variable, like the growth of the plant.
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  • Independant, dependant, control variable - experiment?

    we doing an experiment in school, to see how coke and diet coke affcts our reactions. so 1 person is going to hold a ruler and drop it, the ptherperson after drinking coke tries to catchthe ruler?Independant, dependant, control variable - experiment?
    And what is the goal of the experiment?


    To see if coke and diet coke affects reaction time or something else?


    Let's assume that you are checking on reaction time when ingesting caffeine, and what the differences are between drinking coke and drinking diet coke.





    When you conduct a scientific experiment you need a control to determine what is actually happening (you factor out this variable or you adjust for it). In this case you need a subject who has taken diet coke (subject 1) a person who has taken regular coke (subject 2) and a person who hasn't drunken any cola; the control (they should drink water in a dark opaque glass so the observers don鈥檛 know what they have drunken, not what brand of coke or even if it was coke). Before hand you should test the reaction time of each person and try to get those with the same or very similar reaction times. This way the reaction time doesn't become a variable, or at least it is a variable under your control. What you are testing is the change in reaction time and that is the dependent variable.





    The amount of coke and diet coke consumed is controlled, and this is what is being tested--the effect that taking this much coke has on your reaction time. The control subject doesn't drink any coke so you can tell the difference that each coke had alone. Control subjects help to remove the human variable from the equation. Does a person THINK they have better reaction time after drinking coke or diet coke, and does the act of drinking something affect reaction time?





    Now you are testing the diet coke vs. the regular coke and vs. water (your control). In the case of Coca Cola brand Coke Zero and Diet Coke both have caffeine, but of different amounts than regular coke. The goal of the experiment is to see how much effect caffeine has on a person's reaction time (the time and distance it takes to catch a ruler).





    You want to use a 1'-0'; (or 1 yard) ruler and have the other person hold their hand several inches down the side of the ruler so they can grab it as it falls. The time between dropping it and the other person catching it is their reaction time and this can be seen as the distance that the ruler fell as well as the timed interval done with a stopwatch; and you will need an extra person to time this interval (the same person should time it for each experiment each time). The time difference between each subject should be measured several times and ideally you should have more than just three subjects. You should have say 15 subjects; 5 drinking diet coke, 5 drinking normal coke and 5 not drinking coke. You should test the subjects鈥?reaction time before the experiment and during the course of the experiment. You should use the same person to do the testing each time so that their own reaction time (the time it takes to press the stop watch) is a constant factor and not a variable and therefore can be ignored. Then you can conduct the experiment 4 times for each person to test the effects over a period of time. In this case you would list the results add them up, for each person, and average them by dividing the number by 5 (the number of experiments) for each person and then take the final averages and average them by 4 to arrive at a total average for each category (good experiments involve lots of repetition and have repeatable results) That would give you a mathematical average. Or you could not average the results by 4 and say that this is the difference between each time interval.





    You need the timekeeper to keep the same time and for their reaction time to be independent of the experiment. Ideally, you should substitute a machine to time the distance of the ruler drop. This lets you ignore their reaction time.





    The dependent variable is the amount of time that changes (between drinking each coke and between the type of cokes drunk) since you are averaging it and testing among several people you will get an average value that is closer to the true value of your dependent variable. Your control is the subjects who don't drink and the variables under your control will be the time keeper's reaction time (time to press the stopwatch on and off) and what they drink.





    The regressor would be the distance that the person holds the ruler from the person who drops it. Ideally, each ruler drop should be done by one person and timed with one timekeeper to keep their variables out of your experiment. One old bar trick is to hold a dollar bill and have a person hold their fingers close to it and try to catch it as you drop it. If that person is drunk then their reaction time may decrease, but the true trick is for you to hold the dollar bill close to their fingers so that normal human reaction time is not enough for them to catch the bill. This is why you need a longer ruler, so the subjects of the experiment will have more time to grab the ruler. You need to run the test several times to see the cumulative effect of each drink and each drink should be of the same size. You should also have the person drink the coke (or not) and then wait 5 minutes and test them, then wait 5 more minutes and test them again and wait another 5 minutes and test them a third time and so on. This how your experiment can account for the time it takes for the caffeine to be absorbed by the body. Ideally, you would continue for 20-30 minutes at five minute intervals to allow for each person's different blood chemistry to absorb the coke and you should do this when they have an empty stomach. But, you may not have control over that or the time to do the experiment so many times. It is important to tell your teacher and subjects that the more data you collect the higher your accuracy.





    Finally you need to make sure that each person drinking the coke doesn't know if it is diet or regular coke so that factor won't affect the test and ideally the people conducting the experiment should not know the difference either; this is called a double blind experiment. It is the standard held to for drug companies when they do tests. You can do this fairly simply by concealing the brand of cola with paper. Some people can taste the difference so you want to try and get test subjects who don't notice or have trouble determining the taste difference. You want to remove the variable that they may THINK that their reaction time changes with each type of coke that they drink (this is the blind part of the test). You want to prevent the experimenters to show their own bias by making them blind to the type of drink consumed (hence the phrase double blind test). To do that in idea circumstances you should have all your subjects drink something in a glass that can't be seen through, with 1/3 of your subjects just drinking water. Even a simple experiment like this one can have a lot of variables in it.





    According to Wikipedia: http://en.wikipedia.org/wiki/Dependent_a鈥?/a>


    ';Dependent variables and independent variables refer to values that change in relationship to each other. The dependent variables are those that are observed to change in response to the independent variables. The independent variables are those that are deliberately manipulated to invoke a change in the dependent variables. In short, ';if x is given, then y occurs';, where x represents the independent variables and y represents the dependent variables.





    Depending on the context, independent variables are also known as predictor variables, regressors, controlled variables, manipulated variables, explanatory variables, exposure variables, or input variables.





    The dependent variable is also known as the response variable, the regressand, the measured variable, the responding variable, the explained variable, the outcome variable, the experimental variable or the output variable.';

    What is the role of control of the independent variable and the dependent variable in an experiment?

    The independent variable is the one factor that you change in the experimental group. It's what you are testing.





    The dependent variable is whatever you measure or count as results.

    What would the controlled variable be in a flame test???

    In class we conducted the flame test experiment, the independent variable was the identity of the chemical, the dependent variable was the colour of the flame. So what is the controlled variable???? HELP. PlzWhat would the controlled variable be in a flame test???
    You get to ';control'; the independent variable. That means, you choose, or control, which element you are going to test.





    The color ';depends'; on which variable you choose.

    What is the difference between a manipulated variable and controlled variable?

    in science. [:What is the difference between a manipulated variable and controlled variable?
    The controlled variable is the observation that is measured before and after the experiment. This provides the observable changes.





    The manipulated variable is the item that is changed during the experiment to obtain different data.





    Example: You are testing the heat that plants are healthiest. The heat is the manipulated variable, and the plant is the controlled variable.





    The controlled variable is always kept in the same condition (except of course, for the manipulated variable). There is usually only one manipulated variable, but there might be more than one controlled variable.What is the difference between a manipulated variable and controlled variable?
    the manipulated variable is simply the part of the experiment that is being changed around by the experimentor! : ) the controlled variable is having nothing out of the ordanary changed about it!





    For example, if you set up an experiment to see if plants would grow faster in water or diferent water subsitutes and you had 2 plants in a pot getting an equal amount of oxygen, sunlight, and soil. One plant you fed water and the other you fed ammonia. The Manipulated variable would be the ammonia...because it is the variable you changed. the control variable would be the water because you didn't change that b/c plants normally drink waterrr ; )





    hope that helps!!

    What would the controlled variable be in a flame test???

    In class we conducted the flame test experiment, the independent variable was the identity of the chemical, the dependent variable was the colour of the flame. So what is the controlled variable???? HELP. PlzWhat would the controlled variable be in a flame test???
    You get to ';control'; the independent variable. That means, you choose, or control, which element you are going to test.





    The color ';depends'; on which variable you choose.

    When a loop control variable is not altered during loop execution, a ____ loop may result?

    infiniteWhen a loop control variable is not altered during loop execution, a ____ loop may result?
    n infiniteWhen a loop control variable is not altered during loop execution, a ____ loop may result?
    infinite loop
    Infinite Loop
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  • What is the difference between a manipulated variable and controlled variable?

    in science. [:What is the difference between a manipulated variable and controlled variable?
    In an experiment, variables are all those things that might change and because of that might change the results of your experiment.





    For example if you were studying the evaporation of water from a beaker, some of the things that might affect the rate of evaporation would be:





    wind or air currents in the room


    temperature of the water


    humidity of the air


    surface area of the water





    Usually in such an experiment you are trying to study one of the variables to understand how the result changes if that variable changes.


    This is the manipulated variable - the one you are changing or manipulating, and watching how the results change when you change the variable. For instance, in the experiment above, if you are studying the effect of surface area on evaporation, you might run one trial with the beaker fully covered, then next time cover it 90% of the way, then 80%, 70% etc. Then you could read your data and see how the change in surface area affected the evaporation rate.





    But in order to be sure that the change in results are strictly due to the changing surface area, you would need to make sure that the other variables are controlled, or kept constant. So you would want to make sure that the room temperature, humidity, and water temperature don't change. These are the controlled variables.





    I hope this helps

    Does the VVT(Variable Valve Timing) control the air volume in the engine?

    and how the VVT works and whether it icreases or decreases the volume of the air admitted to the engineDoes the VVT(Variable Valve Timing) control the air volume in the engine?
    the intake valves allow AIR into the engines combustion chamber





    vvt at higher engine speeds allows the INTAKE valve to stay open longer to allow more air and helps to combust more fuel





    vvt at higher speed allows the EXHAUST valve to stay open longer to allow more exhaust to exit quicker

    How would you control variables such as plant location or amount or type of soil?

    If you want to eliminate these variables, plant everything in the same location, using the same type and amount of soil. Buy some potting soil from a store, and put all of your plants in similar containers with the same amount of soil. And, to control location, just keep all of the plants in the same area.





    Of course, if your talking about planting things outside, you can't really control these variables.

    Im confused about the control group,experimetal group,dependent and independent variable?

    can someone explain it to me?Im confused about the control group,experimetal group,dependent and independent variable?
    Pretend you're doing a drug trial.





    The control group is a group that is used as the baseline, to see what happens under normal conditions. The control group does not get any experimental treatment. In a drug trial, the control group gets a fake pill.





    The experimental group gets the experimental treatment (the real pill), so you can test whether the drug works.





    The independent variable is the one you control. Here, you are choosing whether people get a fake pill or a real pill.





    The dependent variable is the one you measure, as an output of the independent variable (i.e., the value of the dependent variable *depends* on the value of the independent variable). You measure the health of both the control and experimental groups as the dependent variable.





    If you did the experiment without a control group and saw an improvement in the health of people taking your drug, you might think the drug is working. But if you have a control group that didn't get the drug and THEIR health also improves, then you know the drug is useless.





    If, on the other hand, the health of the experimental group is statistically better than the health of the control group, that suggests that the drug treatment (the independent variable) works.Im confused about the control group,experimetal group,dependent and independent variable?
    A control group is a group in which nothing happens. For example, let's take a theory that drinking tomato juice will make your hair turn red. You would get ten sets of twins and feed one of each set of twins lots of tomato juice.


    The twins who did not get tomato juice are referred to as the control group, because nothing has changed in their environment. (You use twins in this kind of experiment because both the control twin and the experimental twin have the same genetic background and live in identical surroundings).


    The twin that gets the tomato juice is in the experimental group.


    Dependent variables would be something that is related to what you are doing - in this case, monitoring whether the hair turns red or not. Independent variables are other things that might happen - such as one set of twins gaining weight or growing an extra two inches.


    Does that help?

    What is a control variable?

    i am doing a science fair project and i don't know what the control variable is. HELP ME!!!!!What is a control variable?
    a control variable is when during an experiment you always have one beaker/petri dish that is never used in the experiment.





    So, for example, if you did an experiment on baking soda and vinegar:








    you have two beakers, both filled with vinegar. You add baking soda to one, and talk about what happened in your observations. The other beaker of vinegar is your control variable so you can compare between vinegar in its normal state versus when you add baking soda.





    I hope this helps ! (:What is a control variable?
    The control variable is the variable that isnt being tested on. (the placebo). The placebo is the fake medicine. then some people in the control group will have the placebo effect which is when people think they have the real medicine and they think it works but it really doesnt.
    the variable that you use to compare your other tests with. For example if you are seeing how milk affects the carbonation of soda, Then your control would be just a regular soda with no mailk added.The control variable is never changed
    blah
    When one variable is tested at a time.

    Any one know how to teach variables and control variables to a 5th grader?

    having trouble getting the point across any suggestions?


    she knows the definition but the understanding the meaning is not going so well.


    Just need a basic way to get her to understand.Any one know how to teach variables and control variables to a 5th grader?
    it's like when you eat peanut butter sandwhiches every day for lunch. One day you mom says the hypothesis ';if you add jelly to you sandwhich, then you will like it better'; So you test the experiment. You bring a sandwhich with just peanute butter, the control group, and one with peanut butter and jelly, the jelly is the thing added, or changed, so it is a variable
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  • What variable is it? independent, dependent , control, or constants?

    I am doing a experiment. In which i am boiling a chicken bouillon in water. I am placing them on 3 petri dishes. After that, in one i am placing vinegar ( in order to act as a preservative) . In another i am placing salt (act as another preservative) and the last petri dish i am not placing any thing. What would be the independent, the dependent, the control. and the constant ? Please help me. I want to make sure of my answers. Thank you :)What variable is it? independent, dependent , control, or constants?
    Well the control is the one you are leaving alone, since it is what would happen naturally without you adding things or changing things (the definition of a control). A constant is anything that does not change, like the fact that you use chicken bouillon in water for all three, or that they are all in petri dishes. The independent variable is the one that you are changing, presumably to test your hypothesis - in this case it is what you add (vinegar or salt or nothing). The dependent variable is called that because it depends on the independent variable - it is what changes/happens depending on what the independent variable is. Basically it is your data, what you are collecting to see if it backs up your hypothesis.

    Help!!!!!What is my dependent, indepent and control variables in my science project?

    My science project is ';Which type of potato molds the fastest in a ziplock bag. Organic, natural or a processed potato.Help!!!!!What is my dependent, indepent and control variables in my science project?
    Control variable- Ziplock bag


    Independent variable- type of potato


    Dependent variable- MoldHelp!!!!!What is my dependent, indepent and control variables in my science project?
    Your independent variables are the types of potato


    You dependent variable is the one that you are measuring that is dependent on your independent variables - so, time taken to produce mold.


    Your control variable should be a ziplock bag on it's own. (effectively the experiemental conditions without the independent variable present)

    What was the control of Mendel's experiment? What was the Independent variable?

    Pure bred pea plants were the controls and variable as well !

    Whats is the constant, control, independant, dependant variable, and questions or sug. for further study?

    okay i need the constant, control, independent, Dependant variable, and questions or suggestions for further study for the question ';does the color of construction paper affect how fast it will burn.


    materials: light (fire) different colored construction paper, and timerWhats is the constant, control, independant, dependant variable, and questions or sug. for further study?
    constant: paper


    control: testing paper of no color (white) to use and compare to other colors


    independant: the color of the paper


    dependant: the fire

    What is the ';control'; in an experiement when the tempature is the only variable?

    A chemical experiement is executed at 4 different temperatures to determine the effect of temperature on reation rate. what is the ';control'; or ';control group';?What is the ';control'; in an experiement when the tempature is the only variable?
    the reactants are the control group. the temperature is the variable

    What is the manipulated, responding, and controlled variable in this lab?

    we had to do a potato core isotonality lab. we weigh pieces of potato and then put it in sucrose solution for 2 days, then take it out and measure it again.What is the manipulated, responding, and controlled variable in this lab?
    Independent Variable (aka. 'manipulated variable'): I can actually think of two, depending on how you did the experiment, and what the point of it was. Firstly, the solution into which the potato pieces are placed is going to be an independent variable, i.e. sucrose, distilled water. Secondly, another independent variable could be the starting weight of the potato pieces. But I get the feeling that the only independent variable you were concerned with was the solution, though Im not a mindreader





    Dependent Variable (aka 'responding variable): The change in weight following the 2 day treatment. This is going to represent the volume of water that has travelled osmotically across the membranes of the cells.





    Your controlled variables will be any variables that were kept constant across all of the trials. In other words, any factors that could have influenced the dependent variable, because we are only interested in how the independent variable has influenced the dependent variable. We want everything else to be constant so that we can say that any change that has occurred is due to the independent variable.What is the manipulated, responding, and controlled variable in this lab?
    well the control is the specimen left the same so the part of the potato you didn't touch the





    the manipulated part is called the dependent variable aka potatoes in sugar





    the responding is the dependent variable aka effect ... so what happned to the potatoes
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  • Whats the purpose of a controlled variable?

    I have to write it in my own words...but the textbook doesn't say, so I'm just wondering?Whats the purpose of a controlled variable?
    a variable used to compare with what u r testingWhats the purpose of a controlled variable?
    To help a research problem achieve a result without bias

    What is a control of an extraneous variable?

    please could you help me??


    thanksWhat is a control of an extraneous variable?
    What you just asked is a contradiction- an extraneous variable is something you can't control but may influence the outcome of a study.What is a control of an extraneous variable?
    An extraneous variable is a variable that is not being measured in an experiment but may influence the results. For example, if you want to measure the effect of room temperature on concentration, noise coming in through the windows may influence your results and is therefore and extraneous variable. A control would be to soundproof the room. In other words, a control of an extraneous variable is something that eliminates the influence of that variable on the test results.

    Friday, January 22, 2010

    What is the dependent, independent and the controlled variable?

    in this experiment we have to find the best coin shiner using 5 coins and 4 different products (im choosing vinegar, coke, disinfectant and milk) we put 4 coins in the products for a period of time then take them out and observe the results.





    in the report we have to state the independent variable the dependant variable and the controlled variable im pretty sure that the control is the untouched coin.





    thanks for your help.What is the dependent, independent and the controlled variable?
    An independent variable is one that's results do not change depending on other changes to the experiment. This would make the coin shiners the independent variables.





    The coin will change due to the different shiners, therefore it's results are dependent on the independent variable.What is the dependent, independent and the controlled variable?
    You are right about the control. I think that the dependent variable is the coins that you put in the different liquids, and that the independent variable is the liquids themselves, because ';if x is given, then y occurs';, where x represents the independent variables and y represents the dependent variables





    Independent variables answer the question ';What do I change?';.


    Dependent variables answer the question ';What do I observe?';.


    Controlled variables answer the question ';What do I keep the same?';.';

    In an experiment what do they mean by 'control', 'Independent' variable' and 'dependent variable'?

    independent variable- what you change In an experiment


    Dependent variable- what you measure in an experiment

    What would be my manipulated and Controlled variable?

    im doing a science fair project and i need help on what the manipulated variable and the controlled variable is.


    this is the problem ::::





    PROBLEM: What solvents will remove the permanent marker ink from glass better, water, alcohol, vinegar, or detergent?What would be my manipulated and Controlled variable?
    manipulated variable





    Definition


    Condition or quantity altered (manipulated) to regulate, or initiate a change in, some other condition or quantity





    controlled variable


    Alternative term for independent variable.





    independent variable


    Definition


    Factor or phenomenon that causes or influences another associated factor or phenomenon called dependent variable. For example, income is an independent variable because it causes and influences another variable consumption. In a mathematical equation or model, it is that variable whose value is given. In an experiment, it is the controlled condition (that is allowed to change in a systematic manner) whose effect on the behavior of a dependent variable is studied. Also called controlled variable, explanatory variable, or predictor variable.





    PROBLEM: What solvents will remove the permanent marker ink from glass better, water, alcohol, vinegar, or detergent?





    Answer.


    Control variables ( my suggestions )


    I might add no solvent and use that as the control(independent ) experiment.





    Also cleaning material (cloth?) ,





    pressure applied , (a Weight on cloth pushed with stick ?)





    number of passes across mark (same for each ink line )





    length and applied thickness of ink. ( Three pens per solution and use ruler? confirms if maybe a bad pen )





    Drying time should be approximately equal ( make all lines at same time ?)





    glass cleanliness and moister ( one large piece of glass, wear plastic gloves ,hand oil prints )





    How the solutions are applied also need to be constant throwout experiments. (measure equal amounts ,soaking time before strokes also.)





    glass Temperature equal across the pane








    manipulated variables are the other solvents listed above.





    detergent in solution ? or 100% liquid detergent in bottle might be easier.





    I think that should be all.





    It just looks like al lot :)

    In an experiment what do they mean by 'control', 'Independent' variable' and 'dependent variable'?

    independent variable- what you change In an experiment


    Dependent variable- what you measure in an experiment
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  • What would be my manipulated and Controlled variable?

    im doing a science fair project and i need help on what the manipulated variable and the controlled variable is.


    this is the problem ::::





    PROBLEM: What solvents will remove the permanent marker ink from glass better, water, alcohol, vinegar, or detergent?What would be my manipulated and Controlled variable?
    manipulated variable





    Definition


    Condition or quantity altered (manipulated) to regulate, or initiate a change in, some other condition or quantity





    controlled variable


    Alternative term for independent variable.





    independent variable


    Definition


    Factor or phenomenon that causes or influences another associated factor or phenomenon called dependent variable. For example, income is an independent variable because it causes and influences another variable consumption. In a mathematical equation or model, it is that variable whose value is given. In an experiment, it is the controlled condition (that is allowed to change in a systematic manner) whose effect on the behavior of a dependent variable is studied. Also called controlled variable, explanatory variable, or predictor variable.





    PROBLEM: What solvents will remove the permanent marker ink from glass better, water, alcohol, vinegar, or detergent?





    Answer.


    Control variables ( my suggestions )


    I might add no solvent and use that as the control(independent ) experiment.





    Also cleaning material (cloth?) ,





    pressure applied , (a Weight on cloth pushed with stick ?)





    number of passes across mark (same for each ink line )





    length and applied thickness of ink. ( Three pens per solution and use ruler? confirms if maybe a bad pen )





    Drying time should be approximately equal ( make all lines at same time ?)





    glass cleanliness and moister ( one large piece of glass, wear plastic gloves ,hand oil prints )





    How the solutions are applied also need to be constant throwout experiments. (measure equal amounts ,soaking time before strokes also.)





    glass Temperature equal across the pane








    manipulated variables are the other solvents listed above.





    detergent in solution ? or 100% liquid detergent in bottle might be easier.





    I think that should be all.





    It just looks like al lot :)

    What are some control variables that might not be well controlled in this experiment?

    Taking water samples from various ponds and measuring stuff like temperature, ph, and oxygen levels.What are some control variables that might not be well controlled in this experiment?
    contaminants in the water that may or may not affect oxygen levels, precipitates in the water such as silts or cloudiness in water, extraction sites for water may be at a beach where water is more shallow, resulting in it warming up faster and thus not being a completely accurate gauge of temp. of the entire pondWhat are some control variables that might not be well controlled in this experiment?
    Temperature is not a very good variable to add here. Temperature depends on the amount of exposure to the sun, the season, the warmth, etc. of the enviornment around it. Also, temperature could differ between various areas in the pond, and temperature could change when you take the sample, unless you plan on doing it on the spot.





    P.S. You should limit your experiment to only ONE variable (Or thing that is to be measured). As of this moment, I think acidity/ph would be the most solid thing to base your experiment on.
    none really all will be controlled but the oxygen levels measurement can be the problem because that must be measured at the spot, if you transport it the temp will change which will give another result it also counts for the Ph level.
    Hmmmm.well.


    I think the pickle in the cup would be a control variable but still be verry controlled in that experment.


    Oh, but the solamy sausage is verry un controled. Verry Verry un controled.
    various ponds maybe
    heavy metals, bacteria, algae, toxins, such as pesticides and herbicides

    What are the control variables in the following experiments?

    A researcher wanted to test the effects of cigrette smoke on petrs lungs...





    1) Humans that are smokers


    2) A particular brand of cigarette


    3) Pets that live with smokers


    4) Pets that live with nonsmokers














    A student wanted to conduct an experiment to determine if the background music affects the growth of plants.





    1) Several plants that are exposed to diff. types of music


    2) Several plants that are not exposed to any background music


    3) Rap music


    4) Classical musicWhat are the control variables in the following experiments?
    Pets that live with non-smokers and plants not exposed to music. That's my guess!

    What is my independent variable, dependent variale, and controlled variable?

    Im doing a science project on what color are horses attracted to the best, and a set out green, yellow, blue, and red feed buckets. i led each horse around the buckets and then let them choose the color they like best. i swiched the color around 3 times.What is my independent variable, dependent variale, and controlled variable?
    Independent Variable = bucket color


    Dependent Variable = horse choice


    Controlled Variable = that you treat the buckets the same, not creating any other reason for the horse to choose a bucket other than color. Also, by changing around the arrangement of the buckets you are controlling for position.

    What is our dependent variable and control?(science project)?

    My friend and i are doing a science project on if color affects taste or not. We are going to have random people taste three drink (a,b and c) and tell us what each one taste like. drink A will be sprite with purple food coloring(grape), drink B will be sprite with orange food coloring(orange) and drink C will be plain sprite. What would our dependent variable and control be???





    thx! leave a link to your Qs and I'll answer :DWhat is our dependent variable and control?(science project)?
    Dependent variable does not change. The only thing that does not change is the Sprite.





    Your control is Drink CWhat is our dependent variable and control?(science project)?
    control is the variable you leave the same, independent is the variable that changes , and dependent variable is the thing your trying to find out.





    in your case, the dependent is if coloring effects taste, and the control is the plain sprite.


    any more questions just ask :)

    What exactly is a controlled variable in an experiment?

    Can someone please tell me simply what it is? A example would be nice also.What exactly is a controlled variable in an experiment?
    When you are performing an experiment, you need to compare different results this is where the control comes in. For example if you want to determine if plants grow better in distilled water or Gatorade, you will set up a plant in which you feed only distilled water, one in which you fed only Gatorade and then the control, regular water as this is the norm and what your other experiments will be looked at against.What exactly is a controlled variable in an experiment?
    Controlled variables are external elements that can effect the results in an unwanted way, which have been removed throughout the research process. For example, extraneous noise could affect the performance or concentration of research participants, and therefore must be removed in order for the results to be valid. Unfortunately OMartinez, you are thinking of control and experimental groups.
    the control variable is exactly that: controlled.





    That is the variable that is in its natural environment, and it is compared to the other varibles...





    like in that other guys example, he was correct: the ';control'; is the plant growing in regular water. if you want to test the effects of different substances fueling the growth of a plant, you would use other liquids....he used gatorade and distilled water... you dont know what would happen to the uncontrolled variables, you need something to compare their results to. that is where the control is useful. you know the control is normal and how the plant shuold grow normally, the gatorade might accellerate the growth, and the distilled water might deteriorate the growth, but you know what is normal. you control the environments of the testing subjects... plants in this case.
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  • What is the manipulated variable, the responding variable and what are the 2 controlled variable?

    I have this hw, but i can't seem to figure out this question:


    Does the number of eggs a chicken will lay depend on the amount of time the lights are left on inside the barn?





    what is the manipulated variable, the responding variable and what are the 2 controlled variable?





    Please help. I can't seem to figure out this problem.What is the manipulated variable, the responding variable and what are the 2 controlled variable?
    manipulated variable: the one you change --%26gt; the amount of time the lights are left on





    responding variable: the response you want to check --%26gt; the number of eggs a chicken will lay





    two control variables: the chicken, and the brightness of the lightWhat is the manipulated variable, the responding variable and what are the 2 controlled variable?
    The manipulated variable (or independent variable) is the lights.





    The responding variable (or dependent variable) is the number of eggs





    The controlled variables would be the type of lighting, the chickens used, conditions of the barn... and the list goes on. Pick any two you like!!





    I hope that helps.

    What are the Independent,Dependent&Control Variables of my experiment?

    The experiment im going to do for my schools science fair project is ';Can things be identfied by Just thier smell?';.





    Im going to blind fold people and put an object in front of them and see if he or she could tell me what it is by just the smell of the item.





    I need help on figuring out what my Independent, Dependent %26amp; Control Variables are?What are the Independent,Dependent%26amp;Control Variables of my experiment?
    the problem you have is that you aren't measuring anything. it's a true/false response to whether or not the subject can identify the objects.





    you can collect the number of true/false answers for each object and then do a histogram.





    normally for a dependent and independent variable you need something you can measure like weight, speed, temperature, time.

    What is the independent variable, dependent variable, and controlled variable of this question?

    Does an electric motor turn faster if you increase the voltage?What is the independent variable, dependent variable, and controlled variable of this question?
    independent = voltage


    dependent = rpm


    control = rpm at initial voltage

    What is the relationship between control and a variable?

    i need to find the difference between them also if you have the answer put it there as wellWhat is the relationship between control and a variable?
    in an experiment, you need a constant to base your experiment on. the constant is the ';control';. the ';variable'; is the different. you use the variable to change and test your experiment and compare the experiments to the control. the control will always stay constant, and you will have to record the differences.What is the relationship between control and a variable?
    There are two types of variables:





    independent - variables deliberately manipulated to invoke a change in the dependent variable (variables are what you purposely change)





    and





    dependent - variables that change as a result of your manipulation of the indendent variables





    A control is a group used in an experiment as a regular measure.





    For example, say you were testing to see whether pouring sugar water on pea plants made them grow taller.





    The control group would be the group that you did NOT pour sugar water on, just to see how they grow without the thing that you add.





    The independent variable would be the amount of sugar water (or whether you added it at all) and the dependent variable would be how tall, fast, etc. the plants grew as a consequence of you changing the amount of sugar water.
    The control is always twice the variable when data is collected in a vacuum.
    you need a control to test the varible other wise u dont know what to compare you tests and observations to
    a control in an experiment is what always stays the same


    a variable is something that changes


    like with an experiment finding out what temp. water fish like


    a variable would be the temp. of water


    a control would be the type of tank and fish

    Whats the variable and control(s) in this experiment?

    If i am giving a test with ten easy questions to 30 stundents from each 9th 10th 11th and 12th grade class 15 being boys and 15 being girls and they are going to be timed and then the tests are going to be graded whats the control(s) and variable?Whats the variable and control(s) in this experiment?
    The controls are you are taking 15 girls and 15 boys from each grade.





    The variable is that you are testing each grade, so each of the grade classes are the variable.
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  • What is the constant, independant, dependent, and control variables in the following expiriment?

    I am putting different types of pills in hydrochloric acid to see what pill breaks down faster. If it breaks down faster in the acid, it might break down faster in your stomach acid.What is the constant, independant, dependent, and control variables in the following expiriment?
    The acid used is constant across all your experiments.


    The control could be a pill left alone, although I imagine it would take a very long time to dissolve.


    The independent variable is which pill you are dissolving; this is the variable that you control and change from each experiment.


    The dependent variable would be how long it takes to dissolve; this is going to DEPEND on which pill it is.What is the constant, independant, dependent, and control variables in the following expiriment?
    constant=acid


    control=a pill left alone


    independent=stomach acid


    dependent=hydrochloric acid


    variables=pills

    Why should a control group differ from an experimental group in only one variable?

    That way you know if there was a difference, you can tell what caused the difference. If you were to vary say 10 things, you wouldn't be able to say what of the 10 variables caused the effect.

    What is the controlled variable for comparing two diff apples?

    Hi i want to know more about the controlled variable for comparing two diff (origin) apples' cells...


    Thank you very much.What is the controlled variable for comparing two diff apples?
    The variable you control is the detail you are comparing between them, whatever that may be.

    What is the dependent, independent, controlled variable of my science fair project?

    My project is memory between boys and girls. Who have better memory? I have 5 boys and 5 girls doing my tests. I gave them tests and how long they get to see the tests. Then i ask them wat they remember.What is the dependent, independent, controlled variable of my science fair project?
    There are quite a few online resources that can help you with a science project. Here are a few that should be useful. Best of luck with it.What is the dependent, independent, controlled variable of my science fair project?
    Independent -- since you are testing memory for boys versus girls, your independent variable will be gender.





    Dependent -- Amount they remember. Since you are testing if their is a difference, you START WITH gender (independent) and conclude with amount remembered (dependent upon gender).





    Controlled -- the test you give and how long you let them look at it. You are in charge of both of those so they are controlled by you.

    What is the independent variable, dependent variable, and controlled variable of this question?

    Does fertilizer make a plant grow bigger?What is the independent variable, dependent variable, and controlled variable of this question?
    Ind. Variable = Plant





    Dep. Variable = Amount of Fertilizer





    Controlled Var = Type of fertilizer





    Not so sure about this answer...

    What is the meaning of control variable?

    If you mean when your doing a experiment..


    A control will be the one with no variables, so you could compare your results with the control with your other tests.





    Geez I'm so bad at explaining, hope you understood what I mean..What is the meaning of control variable?
    the controlled variable is the part of an experiement that can lead to getting a bunch of different answers...





    Fro example say your testing a fish's breathing in water... but u will get different results becuase of the controlled variables such as..... the temp of water... it may not be the same in every bowl....What is the meaning of control variable?
    A control variable is a variable in an experiment which is not changed in any of the tested groups.





    For example, if you are testing the effect of chocolate consumption on people, you will have 2 groups:





    One group who stopped eating chocolate, and one group who continued to eat chocolate.





    So, the control variable will possibly be the living conditions of the tested groups, or any other factor which must not be changed IN ORDER TO HAVE A FAIR EXPERIMENT. Hope that helps. :D
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  • What would be the independent, dependent, controlled variables and control in the experiment below?

    Design an appropriate and safe investigation to measure the ph of a variety of skin products.What would be the independent, dependent, controlled variables and control in the experiment below?
    The independent variable is the pH of the products.


    the dependent variable is the skin product being tested.





    You control the skin product and the environment in which the experiment is carried out.





    I'm not sure if you need/there is a control.What would be the independent, dependent, controlled variables and control in the experiment below?
    indepen- the measure of ph


    depen- the result


    control-?

    What is the control and experimental group, independent and dependent variable?

    http://vilenski.org/science/notebook/uni鈥?/a>What is the control and experimental group, independent and dependent variable?
    In an experiment the factor you change is the independent variable. The dependent variable is the factor being measured. The experimental group is the group you compare to the control so you can identify changes that have occurred after you manipulate a factor.

    What is the difference between a controlled variable and a constant?

    I reallllllyyyy need help! I have been looking all over yahoo answers and all over the internet and still have not been ablel to find the difference between them, so can somebody please help me!What is the difference between a controlled variable and a constant?
    Say your experiment was determining how the shape of an object effects how fast it falls.





    The constant is gravity - you can't change that





    Your controlled variable is something you change, like the object you're droppingWhat is the difference between a controlled variable and a constant?
    Controlled can't be changed.














    Help?


    http://www.booksie.com/literary_fiction/鈥?/a>

    What would be the experimental and controlled variable in this experiment and why?

    In this experiment you have two petri dishes, one with water and one with gibberellic acid. You put 10 radish seeds in each, and record how many germinate over the course of five days. What would be the experimental and controlled variable?What would be the experimental and controlled variable in this experiment and why?
    Controlled (independent) variable = presence of gibberellic acid


    Experimental (dependent) variable = number of germinations

    What is the independent variable, the dependent variable and the controlled variable?

    My mother always told me that the green tea is bad for your teeth. I attempted to prove her wrong by creating a controlled experiment. In it, I decided to get two people who volunteered as test subjects; person A was given a schedule where he would drink 3 green tea cups a day, person B was given a schedule where he would drink 3 cups of water every day. The result was that person A had his teeth darkened, person B's teeth remained the same color. What is the independent variable, the dependent variable and the controlled variable?
    independent variable: green tea vs. water


    dependent: teeth color


    controlled: amount of liquid and how long...What is the independent variable, the dependent variable and the controlled variable?
    Good expirement.





    IV: Drink (Water, Green Tea)





    DV: Color of Teeth





    CV: The person same person (it doesnt apply to this one though), amount of liquid, time (how long you ran the expirement), there can be a lot.





    Independent variables answer the question ';What do I change?';.


    Dependent variables answer the question ';What do I observe?';.


    Controlled variables answer the question ';What do I keep the same?';.





    Please pick as 'Best Answer' Thank you. Good luck I hope you get a good grade :)

    What is the difference between an independent variable and a controlled variable?

    I know that an independent variable in an experiment is the variable that remains the same, and the dependent variable is the variable effected by the independent variable.





    So, my question is.. if a controlled variable is a variable that remains ';constant'; or the same, what is the difference?What is the difference between an independent variable and a controlled variable?
    A controlled variable could change, but it will change the same for all treatments. For instance, if you add different amounts of water to plants (independent variable) and measure growth (dependent variable) and you grow them in a greenhouse, the amount of light will be a controlled variable (the light will vary and it will affect plant growth, but it will affect the independent and dependent variable the same). This way you can attribute changes you observe to the independent variable.





    I hope that makes some sense.
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  • How do you enter control variables into SPSS for a Multiple Regression?

    Hi,





    I am doing an Enter method multiple regression and have a few control variables (age, gender, whether or not they have a chronic condition, etc).





    Does anyone know how to do this? If so, can you explain it as simply as possible!





    Any help would be really appreciated as I am really stuck on my dissertation statistics!





    Thank you.How do you enter control variables into SPSS for a Multiple Regression?
    Just put them into the box with all the other independent variables.





    The effect that is given of each variable controls for all the others.How do you enter control variables into SPSS for a Multiple Regression?
    http://www.ats.ucla.edu/stat/spss/webboo鈥?/a>





    http://www.google.com/search?q=SPSS+mult鈥?/a>

    What is a controlled variable in a science experiment?

    I know an independent variable and dependent variable but have trouble understanding a controlled variable?What is a controlled variable in a science experiment?
    It's something kept constant in all the setups of the experiment.





    For example:


    If the experiment is about how the intensity of light affects plant growth, the controlled variables would be things like the type of plant, the amount of soil used, the amount of water used and the colour of the light.





    So basically, it's just variables that are not changed in the experiment.What is a controlled variable in a science experiment?
    There are different ways of defining terms depending on who is teaching you about experiments and it can be confusing.





    One way to think about the inputs to any experiment is to consider 3 types of inputs...


    1) There are factors you set at specific levels, e.g., low, medium, and high or on/off. These are the Controlled variables, the things you are studying.


    2) There are other variables that you are probably ';controlling'; even if you are not thinking about it. These would be things like gravity, if you are doing the experiment on earth, the force of gravity is 1 G or maybe you are doing the experiment in an air conditioned lab so room temperature is pretty close to 20 C and the relative humidity is low or maybe you are blending your ingredients for each experimental run in a kitchen blender on high power. All of these can be called ';SOP'; for standard operating procedure or ';something on paper'; because, if you repeat the experiment, you are pretty sure gravity is still 1 G or high power on the blender is still high power.


    3) Then you have everything else in the universe that might be changing during your experiment. These factors can be called noise. One way to check to see if noise has influenced your experiement to randomize the way you run the experiments. For example, if you have 10 runs at factor A low and 10 at medium and 10 at high and if you run them in sequence and, in the unlikely event that a noise factor does influence the results, there is no way for you to know if it was A or that noise which created what you saw.





    The outputs of your experiment are what ever they are. In addition to the results that you are measuring, there are other outputs you may not think of. These include things like the elapsed time required to complete the experimental run or the time of day when the samples were actually measured.





    hope this helps
    It is an independent variable that does change with respect to conditions attached to an experiment.

    What is the controlled variable in a research interview?

    I'm writing a research essay about a study that was done to assess the impact of television on body image in teen-aged Fijian girls





    I was just wondering, what would the controlled variable be in this situation? The amount of television viewing is not controlled by the researcher, and the interviews are semi-structured.





    Thank you for any and all help!What is the controlled variable in a research interview?
    I think it depends on what kind of study you're doing. Is it experimental or descriptive? An experimental study includes a controlled and experimental variable, whereas a descriptive study involves just describing the results of your research. I think your research would be a descriptive one; you'd just have to describe the kinds of shows/programs the respondents viewed, the respondents' characteristics, then summarize the outcomes of their interviews, and relate that to the impact of television. Since you're just looking at the general impact of television on the respondents' body image, you don't need to specify any variables. You just have to describe your findings.





    You could make it an experimental study though, by making two groups; the control group(the group that watches a lot of television) and the experimental group(the one that doesn't watch much), and compare the body images of the respondents from both groups. In that case, you need to control the amount of television viewing; like make sure there really is a significant difference between the two groups in regard as to how much TV is being viewed.

    How do you use control of variables to determine which variable will influence if a balance remains balanced?

    You have to start with the system equation.

    What is the control and experimental group, independent and dependent variable?

    http://vilenski.org/science/notebook/uni鈥?/a>What is the control and experimental group, independent and dependent variable?
    I'd say the top is the control and the bottom is the experimental. Independent variable is the presence (or absence) of an open-air environment, dependent variable is the presence (or lack) of growth.





    This isn't a great experiment for labeling control and experimental groups, though, because something was done to both groups (boiling the broth) and the second set was eventually un-corked. It would have been better to have three sets - one that was boiled then left open, one that was boiled then sealed and left sealed, one that was boiled and sealed, then opened.What is the control and experimental group, independent and dependent variable?
    I know that the independent variable is the variable that is constant (can't be changed) and the dependent variable depends on the independent variable. God I haven't really done that in so long.

    Wat Iz The Definition OF Control Group,Independent variable,and dependent variable?

    control group (kən′trōl ′grüp)


    (statistics) A sample in which a factor whose effect is being estimated is absent or is held constant, in order to provide a comparison.





    independent variable


    Statistics. A manipulated variable in an experiment or study whose presence or degree determines the change in the dependent variable





    dependent variable


    Statistics. The observed variable in an experiment or study whose changes are determined by the presence or degree of one or more independent variables
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  • What is a control variable?

    please i need help!What is a control variable?
    This is a basic function of all scientific experimentation. The control variable is the variable you control to see how it creates an effect, the independent variable. For example, you can control what temperature you set your thermostat and how you leave your door open or closed, the control variables. How fast your room cools down is the independent variable, because a closed room can cool in a matter of seconds while an open door can make a room stay warm for minutes.What is a control variable?
    Seems that people are confusing ';control variable'; with control group, or even constants.





    A control variable is a variable that you measure in your study and use in your data analysis that is not the main point of your study, but may impact the results and so it can't be ignored (i.e. can't be excluded from your study).





    Say, for example, that you are interested in the relationship between gender and income, hypothesizing that males make more money than females. If you go out and ask 50 men and 50 women ';how much money do you make?'; you could compare males and females in terms of income and, lo and behold, you would probably find that the men earn more money. End of story.....right? NO!





    What if it is the case that men tend to be more educated than women? Could that account for the gender difference in income? Well, you could find out if you also asked your 50 men and 50 women ';how many years did you go to school?';---then, you include years of education as a control variable in your model. Maybe, after ';controlling for'; education, the difference in income between males and females dissappears (probably not, but for the sake of argument.....). Here, you have used education as a control variable in your study of gender differences in income. If you did not control for education, you might erroneously conclude that differences in income are due to gender per se, when in reality the difference (or, perhaps, part of the difference) was due to differences in education.





    So, education is not why you are doing the study, it is not your primary independent variable (or predictor variable), but it is something that you should control for, a control variable.





    Now, that is how the term ';control variable'; is commonly used, but different areas of study (i.e. psychology versus education versus business, etc.) use the term somewhat differently at time. For example, rather than measuring your control variable and including it in your data analysis, you could control for it in your methodology. Using the above example, rather than measuring education and controlling for it in your data analysis, you could control for it in your methodology by making sure that your males and females were the same with respect to education--perhaps by performing your study only on people who had all just graduated from college---so they all have the exact same education. Now, you don't need to measure education because everyone has the same education, and you don't need to include it in your data analysis.





    Either way though, whether you statistically or methodologically control for a variable, the point is the same---it is some variable that could mess up your study so you have to do something about it, but it is not the main point of your study (otherwise it would just be one of your independent variables/predictors).





    Hope that helps
    in an experimet there is the constant and the variables.





    Constant stay the same varables change
    something about the experiment that doesnt change.....like an amount or something that will stay constant
    The control is the object in the experiment that dosent experience change.

    Why square the control variable?

    I m reading a paper...in its regression, it include a control (independent) variable of firm AGE for the proxy of firm reputation. However, it further said that square of the firm's age is also controlled because reputation building may continue to increase BUT at a slower rate. Why squaring the age is needed??? PLEASE HELP...THANKS!!!Why square the control variable?
    AGE is squared because you're dealing with diminishing returns. Think about what the square root function looks like. It increases at a decreasing rate. Since the coefficients have to be linear in a regression model, you change the variables (in this case AGE) to better fit the data when you run the regression. So you square the variable to get the y-variable (reputation?) to have diminishing returns.

    Which variable does the control system atempt to hold at constant value?

    The dependent variable.Which variable does the control system atempt to hold at constant value?
    The independant one.

    Identify the control group, independent and dependent Variable, what should homer's conclusion be?

    Homer notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice will get rid of the green slime. Homer decides to check this out by spraying half of the shower with coconut juice. He sprays the other half of the shower with just water. After 3 days of '; treament'; there is no change in the appearence of the green slime on either side of the shower.Identify the control group, independent and dependent Variable, what should homer's conclusion be?
    Control group is the shower half that gets the plain water treatment. Dependent is slime, independent is coconut juice. He should conclude that coconut juice doesn't affect slime. He should make pina coladas instead.

    What is the control and experimental group, independent and dependent variable?

    http://vilenski.org/science/notebook/uni鈥?/a>What is the control and experimental group, independent and dependent variable?
    In the experiment described there:





    Experimental group: the flask with a straight neck that both air and microorganisms could enter;





    Control: the flask with an S-shaped neck that allowed the air in, but not microorganisms.





    Independent variable: it is a single variable, let's call it X, which denotes either the control or the experimental group. For example, X=0 can mean observing the control group, while X=1 can mean observing the experimental group. This variable can take only one of these two values.





    Dependent variable: let's call it Y, and it denotes whether the flask had shown microbial growth, or not. So, the outcome can be either Y=0 (there was no growth) or Y=1 (there was growth, i.e. contamination). This variable too can take only one of these two values.





    What You need to prove is that the dependent variable Y is somehow linked to the independent one X. You control what You do with the independent variable, and then observe the outcome: the dependent one. So, when You treat the two flasks in a different manner (one with a straight neck X=1 and the other one with a S-shaped neck X=0), You observe whether they will differ with respect to microbial growth. Then You assign Y=1 if there was microbial growth, and Y=0 if not. Obviously, this was not dependent on You, but on whether the hypothesis was correct. Then, if You find that the choice of the dependent variable (using one or other type of flask) always leads to a certain outcome (there is growth or not, i.e. Y=0 or Y=1), then You have linked X to Y.What is the control and experimental group, independent and dependent variable?
    the independent variable and the dependent variable the shapes of the necks and if microorganisms could enter or not





    flask 1 allowing air = experimental


    flask 2 no air = controlled

    Can a router speed control be used with a variable speed hand drill?

    I wouldn't. You already have variable speed in the switch. The speed control reduces the voltage, and I would think that's a bad idea for a drill. Hope this helps.Can a router speed control be used with a variable speed hand drill?
    While any ';universal'; motor (One with brushes) can be slowed down by a speed control box, you have to be careful because many tools now have an electronic speed control system which will be damaged by low voltage. If you must do it, read your owners manual first.Can a router speed control be used with a variable speed hand drill?
    sure if you want to burn up your drill. i dont think it would be worth trying
    Use a GFI outlet if you're going to make this mistake.
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  • What is the purpose of a variable/control in an experiment?

    Help me answer please :D What is the purpose of a variable/control in an experiment?
    to observe if the variable is responsible for the response


    is the salt in salt water making the water salty? well taste distilled water, and then distilled water with salt... the salt in the distilled water is the variable. Its not perfect but you get the idea i hopeWhat is the purpose of a variable/control in an experiment?
    A control is a fancy way of saying a reference point. In the scientific method, one is usually comparing the results of several runs of the experiment, often times changing one variable for each run. The control would be an initial run of the experiment without changing anything. The results are used as a reference point for comparing the results of the other runs to. With a control run, one can produce results that are expressed as %. For example, one could increase ingredient 'A' by 50% and the rate of reaction increased by 20%. A percent is always a ratio, the control is what is on the bottom of the fraction. In the above example, (mass of 'A' in experimental run) / (mass of 'A' in control run) * 100% = 150% and (rate of reaction in experimental run) / (rate of reaction in control run) * 100% = 125%