In an experiment, what is the group called that is exposed to the treatment?

The group that is exposed to the treatment in an experiment is referred to as the experimental group. This designation is important because it allows researchers to observe the effects of the treatment or intervention being tested. By comparing the results from the experimental group to those from a control group—which does not receive the treatment—researchers can determine the effectiveness or impact of the treatment being studied.

In this context, the experimental group is essential for isolating the effects of the variable under investigation, thereby providing meaningful data that can inform conclusions about the treatment's efficacy. Understanding this distinction is critical in experimental design as it directly influences the validity of the study's findings.