Alcohol and heart attacks. Many studies have found that people who drink alcohol

Question

Alcohol and heart attacks. Many studies have found that people who drink alcohol in moderation have lower risk of heart attacks than either nondrinkers or heavy drinkers. Does alcohol consumption also improve survival after a heart attack? One study followed 1913 people who were hospitalized after severe heart attacks In the year before their heart attacks, 47% of these people did not drink, 36% drank moderately, and 17% drank heavily. After four years, fewer of the moderate drinkers had died. .(based on 241-24219.28) Is this an observational study or an experiment? Clearly explain your choice. What are the explanatory and response variables? Suggest two lurking variables that may be confounded with the drinking habits of the subjects. Explain clearly how each of your proposed lurking variables may be confounding, and thereby make it difficult to conclude that drinking habits explain death rates

Explanation / Answer

Its an Observational study. The researcher did not attempt to change the amount that people drank.

The explanatory variable is alcohol consumption.

And the response variable is survival after 4 years

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