The following table comes from a report on the relationship between aspirin use and heart attacks. Political Affiliation Treatment Fatal Non-Fatal Absence of Attack Attack Attack Placebo 18 171 10845 Aspirin 5 99 10933 a) Use X² and G² to test the hypothesis of independence between heart attack and treatment. Report P-values and interpret. b) Use residuals to describe the evidence of association. c) Partition G² into two components to test whether the incidence of heart attacks is independent of aspirin intake, comparing treatments with respect to fatal attack and non-fatal attack and between these two combined and no attack. Report P-values and interpret. d) Combine the cell frequencies for the first two columns of the table (fatal attack+nonfatal attack) and construct a 95% confidence interval for the odds ratio between treatment and presence or absence of heart attack. Interpreter
