Question

which of the following is the best description of a control for an experiment?
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a the control group is kept in an unchanging environment.
b the control group is left alone by the experimenters.
c the control group is matched with the experimental group except for the one experimental variable.
d the control group is exposed to only one variable rather than several.

Explanation:

In an experiment, the control group serves as a baseline. It is identical to the experimental group in all aspects except for the one experimental variable being tested. This allows researchers to determine if the variable has an effect. Option a is incorrect because the environment can change as long as it's the same for both groups. Option b is wrong as the experimenters interact with both groups (e.g., measuring, observing). Option d is inaccurate as the control group is not exposed to the experimental variable at all (not just one variable).

Answer:

C. The control group is matched with the experimental group except for the one experimental variable.