A study in the New England Journal of Medicine compared cardiovascular events for treatments of low-dose aspirin or placebo among 39, 876 healthy female health care providers for an average duration of about 10 years. Results indicated that women receiving aspirin and those receiving placebo did not differ for rates of a first major cardiovascular event, death from cardiovascular causes, or fatal or non-fatal heart attacks. However, women receiving aspirin had lower rates of stroke than those receiving placebo

a. Use software to test independence. Show
(i) Assumptions,
(ii) Hypotheses,
(iii) Test statistic,
(iv) P-value,
(v) Conclusion in the context of this study.
b. Describe the association by finding and interpreting the relative risk for the stroke category.

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Women's Aspirin Study Data Cardiovascular Events Group Minl-Stroke Stroke No Strokes Placebo Aspirin 240 185 259 219 19443 19530