A regression threat to internal validity refers to the fact that:
A) groups selected at extremes will score closer to the average on retesting
B) students often forget what they learned during an intervention
C) a relationship is likely to be smaller when a study is replicated
D) data collectors can influence scores by their behavior

Question

Quizplus · Accepted Answer

Regression to the mean is a phenomenon that occurs when individuals or groups are selected based on extreme scores. Upon retesting, their scores tend to move closer to the average, which is a threat to internal validity because it can make it seem like an intervention had an effect when the change might be due to statistical tendencies rather than the intervention itself.

A Regression Threat to Internal Validity Refers to the Fact