12. Since 1976 the Nurses\' health study has followed more than 100,000 nurses.

Question

12. Since 1976 the Nurses' health study has followed more than 100,000 nurses. Every two years, the nurses fill out a questionnaire about their habits and their health. Results from this study indicated that post-menopausal women have a reduced risk of heart disease if they take a hormone replacement drug. Which of the following is not true concerning this study? A. It is obvious from this study that the hormone-replacement drug reduces the risk of heart disease. B. A possible lurking variable may have caused the relationship, making it not so obvious that hormone-replacement drug reduces the risk of heart disease. C. A randomized experiment would be a better approach to testing the effects of the hormone-replacement drug. D. This study is an observational study.

Explanation / Answer

Correct option is (D)THis is an observational study is not true

Since this is not an observational study as it is said that post-menopausal women have reduced risk of heart disease if they take a hormone replacement drug(controlled study and is called experimental study).

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