A study reported in a journal found that in a certain state retired male policemen are more likely to have heart disease compared to other men with similar ages but different occupations. Data from the study were that about 34% of a sample of 200 retired policemen had heart disease but only 17% of a sample of 800 men with other occupations had heart disease.   (a) In Chapter 6, we learned about the various types of studies. Is this an observational study or a randomized experiment? Explain. This is a randomized experiment because the researchers simply observed the proportion with heart disease for both policemen and men of other occupations.This is an observational study because the researchers assigned certain men to be policemen or not.     This is an observational study because the researchers simply observed the proportion with heart disease for both policemen and men of other occupations.This is a randomized experiment because the researchers assigned certain men to be policemen or not. (b) Do you think that we can attribute the observed difference in heart disease percentages to job-related factors? Explain   c)Calculate a 95% confidence interval for the proportion of retired policemen in the state who have heart disease. (Round your answers to three decimal places.) __to___ d) Calculate a 95% confidence interval for the proportion of other retired men who have heart disease. (Round your answers to three decimal places.) ___to___

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A study reported in a journal found that in a certain state retired male policemen are more likely to have heart disease compared to other men with similar ages but different occupations. Data from the study were that about 34% of a sample of 200 retired policemen had heart disease but only 17% of a sample of 800 men with other occupations had heart disease.
 
(a)
In Chapter 6, we learned about the various types of studies. Is this an observational study or a randomized experiment? Explain.
This is a randomized experiment because the researchers simply observed the proportion with heart disease for both policemen and men of other occupations.This is an observational study because the researchers assigned certain men to be policemen or not.     This is an observational study because the researchers simply observed the proportion with heart disease for both policemen and men of other occupations.This is a randomized experiment because the researchers assigned certain men to be policemen or not.
(b)
Do you think that we can attribute the observed difference in heart disease percentages to job-related factors? Explain
 
c)Calculate a 95% confidence interval for the proportion of retired policemen in the state who have heart disease. (Round your answers to three decimal places.)
__to___
d)
Calculate a 95% confidence interval for the proportion of other retired men who have heart disease. (Round your answers to three decimal places.)
___to___
 
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