Preliminary information suggests that the effect of (face-to-face) counseling is larger for migraine sufferers who are women than men. Knowing this, the scientist would probably use a: A) completely randomized design. B) block design, with counseling and no counseling as the blocks. C) block design, with women and men as the blocks. D) stratified random sample.
Social Studies · College · Tue Nov 03 2020
Answered on
C) block design, with women and men as the blocks.
A block design is used when there are known variables that may influence the outcome, and the goal is to control for these variables. In this case, gender is a potential influencing factor, so using a block design with women and men as the blocks would allow the scientist to analyze the impact of counseling separately within each gender group.