Social Studies, 30.03.2020 21:20 fespinoza019

This question refers to a study to determine whether a 100 mg caffeine pill, taken each morning before class, can improve the performance of a typical student on a statistics exam. Suppose all students in a 8:30 a. m. section are given the caffeine pill and all students in a 9:30 a. m. section are not permitted to have any caffeine before class. Later their scores from the midterm are compared.

Is this a controlled experiment or an observational study?

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This question refers to a study to determine whether a 100 mg caffeine pill, taken each morning befo...