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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A new study is investigating the effects of an experimental drug, Exerzisin, on the duration and intensity of exercise. In the treatment group participants are given daily Exerzisin at the main treatment facility and instructed to exercise as much as they would like on the facility's exercise equipment. Due to an insufficient number of exercise units at the main treatment center, the control subjects are given free access to an outside, private gym. The duration and intensity of exercise in both groups is measured with a pedometer. The perspicacious undergraduate, hired to input all the data, points out that the treatment group may be more motivated to exercise harder and longer because their exercising can be observed by the investigators. To which form of bias is he alluding?
assistant
Hawthorne effect