A psychologist provides therapy to 20 extremely fearful people,and finds that over the next six months,most become less fearful.The psychologist concludes that the therapy helped.What is a major defect in this study?

Question

A psychologist provides therapy to 20 extremely fearful people,and finds that over the next six months,most become less fearful.The psychologist concludes that the therapy helped.What is a major defect in this study?​

Quizplus · Accepted Answer

The major defect in this study is that it lacks a control group, which means there is no way to compare the improvement in the treatment group to a group that did not receive the therapy. Without a control group, it is impossible to determine if the therapy was truly effective or if the improvement was due to other factors such as the passage of time, a placebo effect, or regression toward the mean.

A Psychologist Provides Therapy to 20 Extremely Fearful People,and Finds