Question: A study design uses, for example, two groups of people representing a disease-free population who are then classified as exercisers and nonexercisers. After a period

A study design uses, for example, two groups of people representing a disease-free population who are then classified as exercisers and nonexercisers. After a period of time, the mortality rates of each group are compared. This design is called a(n) A. cohort study B. ex post facto study C. participant observation study D. experimental study

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