Regression is especially problematic in which of the following situations?
A)When the experimental and comparison groups are equal at posttest
B)When one group has an extremely high score at pretest
C)When the experimental and comparison groups are equal at pretest
D)When one group has an extremely low score at posttest

Question

Quizplus · Accepted Answer

Regression to the mean occurs when extreme scores on a measure tend to become less extreme upon re-testing. If one group has an extremely high score at pretest, it is likely that their score will regress to a more average level at posttest, which can lead to misleading conclusions about the effectiveness of an intervention.

Regression Is Especially Problematic in Which of the Following Situations