Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 15 Nov 2017 My Price 8.00

Nurses’ Health Study

1Hormone therapy and heart disease 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 postmenopausal women have a reduced risk of heart disease if they take a hormone replacement drug.

a. Suppose the hormone-replacement drug actually has no effect. Identify a potential lurking variable that could explain the results of the observational study. 

b. Recently a randomized experiment called the Women’s Health Initiative was conducted by the National Institutes of Health to see if hormone therapy is truly helpful. The study, planned to last for eight years, was stopped after five years when analyses showed that women who took hormones had  actually increase the risk. 3 How is it that two studies could reach such different conclusions? (For attempts to reconcile the studies, see a story by Gina Kolata in The New York Times , April 21, 2003.)

. Explain why randomized experiments, when feasible, are preferable to observational studies.

Answers

Maurice Tutor
(5)
Status NEW Posted 15 Nov 2017 08:11 PM My Price 8.00

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