A researcher wanted to study the relationship between coffee drinking and heart

Question

A researcher wanted to study the relationship between coffee drinking and heart problems. The heart problems could be negligible, mild, or severe, so the interest is in people in general. She picked several area hospitals and interviewed the patients who are currently being hospitalized. She found that the inpatients who are being treated for heart problems drank an average of 2.7 cups of coffee per day, while the inpatients who are being treated for other problems averaged only 1.4 cups of coffee per day. What conclusion could you draw about coffee as a cause of heart problems from this information?

Note: read all the options and pick the most reasonable one.

Explanation / Answer

here option D is correct:

None, because only people being hospitalized were interviewed, whereas the research question is about people in general.

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