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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 • p-value ≈ . 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 Aspirin-1.21-5.695 .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
- Statistics, Statistical hypothesis testing, 1 pt, 1pt