Matching on pretest scores makes a study vulnerable to:
A) regression effects
B) selection by maturation effects
C) both a and b
D) neither a nor b

Question

Quizplus · Accepted Answer

Matching on pretest scores can lead to regression effects because individuals with extreme scores tend to regress to the mean on subsequent tests. It can also lead to selection by maturation effects if the groups differ in their natural rate of maturation or change over time.

Matching on Pretest Scores Makes a Study Vulnerable To