What is the main reason for using a control group in an experiment?

Question

A
To increase the sample size of the study.

B
To ensure the experiment is ethical.

C
To provide a baseline for comparing the effects of the treatment.

D
To reduce the cost of conducting the experiment.

Answer 1

C. To provide a baseline for comparing the effects of the treatment.

Using a control group allows researchers to determine the effect of the treatment by comparing it to a group that does not receive the treatment, helping to isolate the treatment's impact.