In an experiment, which statement describes the experimental group?

• A. Receives treatment
• B. Receives placebo only
• C. Is not involved in the study
• D. Receives no treatment

Answer: (A)

In experiments, the group that is exposed to the treatment or manipulation of the variable being tested is the experimental group. This group receives the treatment, which is why the statement describing them as receiving treatment is the best answer. The purpose is to compare outcomes with a control group that does not receive the treatment (and may receive a placebo or no treatment) in order to determine the treatment’s effect. The option describing a placebo-only situation typically refers to the control group, not the experimental group; the option about not being involved means they aren’t part of the study at all; and the option about receiving no treatment describes a no-treatment control, again not the experimental group.