In a study on treatments for anorexia, researchers recruited 30 teenage girls with anorexia. The girls were ranked by weight prior to the study. Of the heaviest three girls, one was randomly assigned to a "family" therapy, one to a "cognitive/behavioral" therapy, and one to a control group. The same was done for the next three heaviest girls, down to the three lightest girls. After five weeks of treatment, researchers weighed the participants. Researchers would like to determine which, if any, of the treatments are most effective in treating anorexia.
-What type of study design did the researchers use?

Question

Quizplus · Accepted Answer

The researchers used a blocking study design by grouping the participants into blocks of three based on their initial weight and then randomly assigning treatments within each block.

In a Study on Treatments for Anorexia, Researchers Recruited 30