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Author Question: A prospective study on the relationship between sleep deprivation and heart disease was done by ... (Read 122 times)

soccerdreamer_17

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on: Jul 24, 2018
A prospective study on the relationship between sleep deprivation and heart disease was done by Ayas, et. al. (Arch Intern Med 2003). Women who slept 6 hours a night were compared to women who slept for 8 hours a night (reference group). After adjusting for potential confounding variables like smoking, a 95 confidence interval for the relative risk of heart disease was (0.98, 1.42). Based on this confidence interval, state what the association between sleep deprivation and heart disease is.

Question 2

At a small college somewhere on the East coast, 20 of the girls and 30 of the boys smoke at least once a week. Independent random samples of 75 girls and 100 boys are to be selected and the proportions of smokers in the samples are to be calculated. What is probability that the sample proportion of girl smokers is greater than the sample proportion of boy smokers?


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tjayeee

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Reply #1 on: Jul 24, 2018
Answer to Question 1

There is no conclusive evidence, based on this study, that the association (as measured by relative risk) is different from 1 (equal risk).

Answer to Question 2

0.0623


soccerdreamer_17

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Reply #2 on: Jul 24, 2018
Both answers were spot on, thank you once again


tjayeee

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Reply #3 on: Jul 24, 2018
Great! Please up vote :D


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