One problem with the pretest-posttest design is that
A) participants cannot be randomly assigned to groups.
B) the pretest may sensitize participants to the true purpose of the experiment.
C) pretests typically confuse participants.
D) twice the number of participants will be required.

Question

Quizplus · Accepted Answer

The pretest may sensitize participants to the true purpose of the experiment, leading to changes in behavior that cannot be attributed to the independent variable being tested. This may threaten the internal validity of the study.

One Problem with the Pretest-Posttest Design Is That