Which of the following is an advantage of using a pretest-posttest design over using a posttest-only design?
A)It assesses whether the groups are equivalent.
B)It enables participants to figure out what is being studied and why.
C)It uses less time to conduct the experiment.
D)It minimizes demand characteristics.

Question

Quizplus · Accepted Answer

A pretest-posttest design allows researchers to assess whether the groups are equivalent before the treatment is administered, which increases the internal validity of the study. In contrast, a posttest-only design does not provide information about group equivalence and is therefore more susceptible to selection bias. B is incorrect because both designs can lead to participants figuring out what is being studied and why. C is also incorrect because a pretest-posttest design usually takes more time than a posttest-only design due to the need to administer the pretest. D is incorrect because a pretest-posttest design may actually increase demand characteristics since participants may alter their behavior based on their performance on the pretest.

Which of the Following Is an Advantage of Using a Pretest-Posttest