Final Exam $-$ Winter $2023,2024-$ Requires Respondus LockDown Browser

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Measurement bias

Question $26(5$ points$)$

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A researcher finds $4000$ men over $40$ who exercise regularly, have not had a heart attack, and are willing to participate in the study. She assigns $2000$ of the men to a regular program of supervised exercise. The other $2000$ continue their usual habits. Both groups are followed for five years and fewer heart attacks are observed in the group assigned to a regular program of supervised exercise.

Reference: Ref $8-4$

The response variable in this experiment is

a$)$ whether the symptoms lessened.

b$)$ whether a heart attack occurred.

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c$)$ the age of the men.

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d$)$ the proportion of heart attacks occurring in the supervised exercise group.

Question $27(5$ points$)$