No, it is not important because there should be only one change made to a group. This would be the experimental group. There should only be 1 independent variable (the variable you deliberately changed) in an experiment, so that you can find a direct cause and effect relationship. The dependent variable will be the result of this change, and the controlled variable will help you to determine the difference between what you did to an experiment and what would normally happen. The point of most experiments is that the control group and the experimental group differ in only one way.Is it important that the experimantal group and control group differ in only one way in an experiment?
Of course. Otherwise you don't know which difference you are measuring.
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