_______ effects occur when environmental events other than the treatment influence the participants' scores in one treatment differently than in another treatment.
A)Subject selection bias
B)Volunteerism
C)Fatigue
D)History

Question

Quizplus · Accepted Answer

History effects refer to the influence of external events, other than the treatment, that occur between the pretest and posttest measurements and could explain the differences in scores.

_______ Effects Occur When Environmental Events Other Than the Treatment