Multiple Choice
A threat to internal validity of a study using a two-group pretest-posttest design is that:
A) external events are extremely likely to affect the outcome of these studies.
B) people are more likely to drop out of this type of study.
C) the pretest may sensitize subjects so they change their behavior or responses on the posttest.
D) there is no way to determine if the groups are alike before starting the study.
Correct Answer:
Verified
Correct Answer:
Verified
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