Studies that assign subjects to intervention groups on the basis of their extreme scores are vulnerable to regression toward the mean.

Question

Studies that assign subjects to intervention groups on the basis of their extreme scores are vulnerable to regression toward the mean.​

Quizplus · Accepted Answer

Studies that assign subjects to intervention groups based on their extreme scores are more likely to show regression towards the mean. This occurs because extreme scores are more likely to be caused by random fluctuations, so subsequent measures tend to be less extreme. This effect can lead to an overestimation of the effectiveness of an intervention, as scores may improve over time regardless of the intervention.

Studies That Assign Subjects to Intervention Groups on the Basis