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A study looked at the relationship between coronary heart disease (CHD) and coffee consumption in a group of 40-55 year old men. Among the 790 heavy coffee drinkers (at least 100 cups per month), there were 38 CHD cases. Among the 928 moderate and non-drinkers (less than 100 cups per month), there were 39 CHD cases.
(a) Test the hypothesis that the rate of CHD is higher for heavy coffee drinkers at the 5% level of significance.
(b) Obtain the p-value for the value of the test statistic in (b).
(c) What would the p-value be if the hypothesis to be tested was simply that the rate of CHD differs between the two groups?
(d) Obtain a 95% confidence interval for the difference in the population proportions of CHD cases between the two categories of coffee drinkers.
All parts should be answered as briefly as possible (quality not quantity!). A few sentences will suffice. Just get your opinions across succinctly. Unnecessarily long answers will
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