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Unformatted text preview: STA 3024 Assignment 3: Key for Form 1 9 1. (8 points=2pts for each answer) • X 2 ≈ 21 . 8 • expected cell count: Treatment fatalattack nonfatal noattack Placebo 13.99 134.95 10885.05 Aspirin 14.00 135.0489 10892.95 • pvalue ≈ . 00002 • decision: we reject the hypothesis of independence of Myocardial infarction and Aspirin. 2. (8 points=4 for table and 2 for each interpretation) Standardized residuals: Treatment fatalattack nonfatal noattack Placebo 1.07 3.10.384 Aspirin1.073.049 .384 Interpretation: The residuals in the first and the last cells of the first row are lower in absolute value than 2.Thus:there is not enough evidence that the population number of subjects taking placebo and having fatal hear attack is any different than the number we would expect if the treatment was inde pendent of Myocardial infarction. Similarly there is not enough evidence that the population number of subjects taking a placebo and having no attack is any different than the number we would expect if Myocardial infarction was independent of Treatment.would expect if Myocardial infarction was independent of Treatment....
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 Spring '08
 TA
 Statistics, cell phone, 2pts, 1pt

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