Question: Smoking and heart attacks Repeat the previous exercise, considering another potential confounding variable whether the physicians smoked. The contingency table cross-classifies treatment group by smoking

Smoking and heart attacks Repeat the previous exercise, considering another potential confounding variable—

whether the physicians smoked. The contingency table cross-classifies treatment group by smoking status.

Smoking Status Treatment Never Past Current Total Aspirin 5,431 4,373 1,213 11,017

Smoking Status Treatment Never Past Current Total Aspirin 5,431 4,373 1,213 11,017 Placebo 5,488 4,301 1,225 11,014

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