As part of an experiment to test the effectiveness of a drug for depression, one group of participants receives a pill that does not contain any active ingredients. The inclusion of these participants MOST directly indicates that the experiment involves which of the following?

Question

Quizplus · Accepted Answer

Including a group that receives a placebo indicates that the experiment involves a placebo group. A placebo group is a control group that receives a treatment that does not contain any active ingredients, such as a sugar pill or saline solution, in order to rule out the possibility that the results are due to a placebo effect.

As Part of an Experiment to Test the Effectiveness of a Drug