A researcher wanted to study the relationship between coffee drinking and heart problems. She interviewed all patients at several area hospitals and found that patients in the hospital for treatment of heart problems drank an average of 2.7 cups of coffee per day (Margin of error is 1.4 cups) while those patients being treated for other problems averaged only 1.4 cups of coffee per day (Margin of error is 0.8 cups). What conclusion can you draw about coffee as a
Cause of heart problems from this information?
A) Coffee is bad for you.
B) Coffee is good for you.
C) Heart patients drink more coffee than other patients.
D) None, because only patients in hospitals were interviewed.

Question

Quizplus · Accepted Answer

The researcher only interviewed patients in hospitals, so the results may not be generalizable to the population as a whole.

A Researcher Wanted to Study the Relationship Between Coffee Drinking