Lyle conducted a study to determine if a new class program could increase the test performance of students with high functioning autism.His experiment specifically included those students who already had high test scores.He should be concerned about which potential form of internal invalidity in his experiment?
A) mortality.
B) testing.
C) maturation.
D) statistical regression.
E) history.

Question

Quizplus · Accepted Answer

Statistical regression is a concern because the study involves students who already have high test scores, and their scores might regress to the mean over time, making it seem like the program had an effect when it might not have.

Lyle Conducted a Study to Determine If a New Class