Friday, January 22, 2010

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

No comments:

Post a Comment