A researcher conducts a clinical trial to determine the effectiveness of a behavioral strategy used to reduce overall caloric intake. Because men consume many more calories than women and because women are more likely to diet than men, the researcher decides to only include women in the clinical trial. What type of restricted random assignment was used in this example?
A. control by matching
B. control by representation
C. control by participation
D. control by holding constant
Ans: D
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What will be an ideal response?