Which of the following is an advantage of using gender as a second factor in a study comparing two treatment conditions instead of using a mixed group of males and females in each treatment?
a. The two-factor study would show how the treatments affect males and females separately
b. The two-factor study would determine whether the treatment effect depends on gender.
c. The two-factor study could reduce variance if the scores for males are consistently higher or lower than the scores for females.
d. All of the other options are advantages of the two-factor study.
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