18. Depression. A study published in the Archives of

Chapter 22, Problem 18

(choose chapter or problem)

18. Depression. A study published in the Archives of GeneralPsychiatry in March 2001 examined the impact of depressionon a patients ability to survive cardiac disease.Researchers identified 450 people with cardiac disease,evaluated them for depression, and followed the groupfor 4 years. Of the 361 patients with no depression,67 died. Of the 89 patients with minor or major depression,26 died. Among people who suffer from cardiacdisease, are depressed patients more likely to die thannon-depressed ones?a) What kind of design was used to collect these data?b) Write appropriate hypotheses.c) Are the assumptions and conditions necessary for inferencesatisfied?d) Test the hypothesis and state your conclusion.e) Explain in this context what your P-value means.f) If your conclusion is actually incorrect, which type oferror did you commit?