Regression to the mean can occur when
A) performance on two measures is not completely correlated
B) there is selection on the basis of a measure correlated with the measure of interest
C) a person who scores on the extremes on one test scores closer to the middle on a later test
D) All of these are true.

Question

Quizplus · Accepted Answer

Regression to the mean is a statistical phenomenon that occurs when two variables are not perfectly correlated, when there is selection based on extreme scores, and when individuals who score at the extremes on one occasion tend to score closer to the average on subsequent occasions. This means all the provided options (A, B, C) are instances where regression to the mean can occur.

Regression to the Mean Can Occur When