HELP NOW! homework 4 2morrowWhy is it important to have a single variable between a control group and an experimental group?
Your control group would have no variables so you can see what happens when you introduce a variable to the experimental group. You would not want more than one variable because then you would not know what each variable is doing to the experiment.Why is it important to have a single variable between a control group and an experimental group?
With a single variable it is easy to note the changes and you can say with some degree of confidence that it is the variable that caused the change. With 2 or more variables it is not possible to say for certain what caused the change(s), thus you only introduce 1 variable at once. If you need a second variable you have to do a whole bunch of tests to ascertain what actually is responsible for changes occurring.
To put it simply:
Add 1 variable. Observe effect compared to control group = effect of variable.
Add 2 variables. Observe effect compared to control group. Was effect due to variable 1 or 2 or combination of both (and if so in what ratio)?
One variable makes things much easier to control.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment