What is the advantage of the pretest in the nonequivalent control group pretest-posttest design?
A. If the pretest scores are different, the study can be discontinued immediately.
B. Participants who experience a pretest generally score higher on a posttest.
C. When groups are not equivalent, researchers can look at changes from pretest to posttest scores.
D. The pretest accustoms the participants to the procedures of the study.
Answer: C
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