In a fair experiment, what is the purpose of a control group?

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Multiple Choice

In a fair experiment, what is the purpose of a control group?

Explanation:
A control group provides a baseline for comparison by keeping all other variables constant. In a fair experiment, you change only the independent variable, while everything else stays the same between the groups. The control group shows what happens without the treatment, so any difference you observe can be attributed to the variable you changed. This isn’t about testing the maximum effect, eliminating measurements, or creating confusion—the control helps isolate the true effect of the variable being studied.

A control group provides a baseline for comparison by keeping all other variables constant. In a fair experiment, you change only the independent variable, while everything else stays the same between the groups. The control group shows what happens without the treatment, so any difference you observe can be attributed to the variable you changed. This isn’t about testing the maximum effect, eliminating measurements, or creating confusion—the control helps isolate the true effect of the variable being studied.

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