________ refers to an extraneous variable that occurs when test units with extreme scores move closer to the average score during the course of the experiment.
A) Statistical regression
B) Instrumentation
C) Selection bias
D) None of the above

Question

Quizplus · Accepted Answer

Statistical regression occurs when extreme scores on a variable tend to move closer to the average score when the test is repeated. This can be a source of error in experiments, as it can appear as if the experimental treatment had an effect when it is actually just a result of statistical regression.

________ Refers to an Extraneous Variable That Occurs When Test