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Unformatted text preview: STA 3024 Assignment 3: Key for Form 1/7 1. (8 points=2pts for each answer) • X 2 ≈ 68 . 499 • expected cell count: Treatment fatalattack nonfatal noattack Placebo 17.02 118.18 10966.8 Aspirin 16.97 117.82 10933.21 • pvalue ≈ . 0000000000000000 • decision: we reject the hypothesis of independence of Myocardial infarction and Aspirin. 2. (6 points=3 for table and 1 for each interpretation) Standardized residuals: Treatment fatalattack nonfatal noattack Placebo 1.21 5.686.64 Aspirin1.215.695 .64 Interpretation: The residuals in the first and the last cells of the first row are lower in absolute value than 2.Thus:there is noy enpight evidence that the population number of subjects taking placebo and hav ing fatal hear attack is any different than the number we would expect if the treatment were independent of the Myocardial infarction. Similarly there is not enought evidence that the population number of subjects taking a placebo and having no attack is any different than the...
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 Spring '08
 TA
 Statistics, Statistical hypothesis testing, 1 pt, 1pt

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