Wednesday, January 20, 2010

In an experiment, why is it important to have a control, and a single variable being tested?




~Thanks!In an experiment, why is it important to have a control, and a single variable being tested?
Control provides you with a reference point to determine what change (if any) occurred when a variable was modified.





If you test more than one variable, you won't know which variable caused the resulting change in the item being tested.In an experiment, why is it important to have a control, and a single variable being tested?
It's important to have a control condition because it helps you to see how much of a difference the variable made. =)
So that you know what is causing variations in results, and what you can compare it to.
The control is there to see what changed and the single variable is to know what caused the change
If you don't have a control, then you don't know how the subject reacts when when there is no outside influence.
so everytime u test it the results come out similar
ya,cause it is not a free experiment.

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