Which of the following research situations is most likely to use a within-subjects design?
a. Evaluation of the effectiveness of an exercise program by measuring how much weight is lost during 6 months of strength training.
b. Evaluation of the effectiveness of a blood pressure medication by comparing blood pressure before and after the medication.
c. Evaluation of the difference in verbal skills between 3-year-old girls and 3-year-old boys.
d. Evaluation of the development of verbal skills for a group of 2-year-old girls and a separate group of 3-year-old girls.
Ans: B
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