If a researcher decides to insure through matching that two nonequivalent groups start with the same pretest score, results could very likely be affected by
A)history
B)testing
C)regression
D)maturation

Question

Quizplus · Accepted Answer

Regression to the mean can occur when groups are matched on pretest scores, as extreme scores tend to move closer to the average on subsequent tests, potentially affecting the results.

If a Researcher Decides to Insure Through Matching That Two