Researchers conduct a study to compare attitudes of first- and last-year medical students toward mental illness. To

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Researchers conduct a study to compare attitudes of first- and last-year medical students toward mental illness. To perform the study, researchers surveyed 111 first and last year students from the Faculty of Medicine of the University of Porto, Portugal.

In Exercises 19 and 20, determine whether the study is an observational study or an experiment. Explain.

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