In one-group pretest-posttest design, which of the following will occur whenever researchers gather a set of extreme scores taken at one time and compare them with scores taken at another point in time?
A)Regression toward the mean
B)Propensity score matching
C)Selection differences
D)Testing effects

Question

Quizplus · Accepted Answer

Whenever extreme scores are selected at one time and compared with scores taken at another point in time, there is often a tendency for the extreme scores to regress or move towards the mean. This occurs due to the fact that extreme scores are often a result of random fluctuation or measurement error and are thus unlikely to be replicated. As a result, when extreme scores are retested, they tend to move closer to the average score.

In One-Group Pretest-Posttest Design, Which of the Following Will Occur