HOAE General Science Practice Test 2026 - Free General Science Practice Questions and Study Guide

In clinical trials, a comparison baseline is needed to see whether the treatment actually has an effect. The group that does not receive the active treatment serves as that baseline, so they are called the control group. The control group may receive no treatment or a placebo to keep the study blind, depending on the design. This setup lets researchers compare outcomes against a similar group that didn’t get the active therapy, isolating the treatment’s impact. The other terms describe groups that do receive the active treatment (experimental or treatment groups) or a specific type of control that uses an inert substance to mimic treatment (placebo), but the general non-active comparison group is the control group.