Reference no: EM131405850
Refer to Exercises 2 and 1. Find the odds ratio for remaining free of heart disease for men with no anger compared with men with the most anger. Give the result in a sentence that someone with no training in statistics would understand.
Exercises 1
Refer to the data in Exercise 2, showing the frequency of coronary heart disease for men with no anger and men with the most anger. Show how the numbers in the following statement were calculated: The odds of remaining free of heart disease versus getting heart disease are about 24 to 1 for men with no anger, whereas those odds are only about 8.5 to 1 for men with the most anger.
Exercise 2
Exercise 2 concerned the relationship between anger and the risk of coronary heart disease. Some computer output for a chi-square test is shown below. What do the results indicate about the relationship? Explain.
Exercise 3
Do grumpy old men have a greater risk of having coronary heart disease than men who aren't so grumpy? Harvard Medical School researchers examined this question in a prospective observational study reported in the November 1994 issue of Circulation (Kawachi et al., 1994). For 7 years, the researchers studied men between the ages of 46 and 90. All study participants completed a survey of anger symptoms at the beginning of the study period. Among 199 men who had no anger symptoms, there were 8 cases of coronary heart disease. Among 559 men who had the most anger symptoms, there were 59 cases of coronary heart disease.
a. Construct a contingency table for the relationship between degree of anger and the incidence of heart disease.
b. Among those with no anger symptoms, what percentage had coronary heart disease?
c. Among those with the most anger symptoms, what percentage had coronary heart disease?
d. Draw a bar graph of these data. Based on this graph, does there appear to be an association between anger and the risk of coronary heart disease? Explain.
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