Science第 84 / 120 题
What is the primary purpose of a control group in an experiment?
a.To provide a baseline for comparison
b.To change the independent variable
c.To guarantee the hypothesis is correct
d.To measure only the dependent variable
解析
A control group does not receive the experimental treatment and serves as a baseline for comparison. Comparing the experimental group to it helps isolate the effect of the independent variable.
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