"Female body builders" is the experimental group. Those are the participants the experimenters think have received a treatment, the activity of body building.

"general population" is the control group. This is the group the researchers compared the body builders scores to to try and figure out what changes body building can cause in individuals.

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Hypertext tutorial to teach social science experimental design by Don R. Osborn is licensed under a Creative Commons Attribution 3.0 United States License.
Based on a work at cas.bellarmine.edu.
Permissions beyond the scope of this license may be available at drosborn@bellarmine.edu.