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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 ≈ 24 . 63 • expected cell count: Treatment fatalattack nonfatal noattack Placebo 12.48 122.82 10933.7 Aspirin 12.52 123.18 10966.3 • p-value ≈ . 0000045 • 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-.985 3.36-.322 Aspirin .984-3.35 .322 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 treatment was independent 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.expect if Myocardial infarction was independent of Treatment....
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This note was uploaded on 12/15/2011 for the course STA 3024 taught by Professor Ta during the Spring '08 term at University of Florida.
- Spring '08