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Unformatted text preview: STA 3024 Assignment 3: Key for Form 2 8 1. (8 points=2pts for each answer) • X 2 ≈ 24 . 02 • expected cell count: Treatment fatalattack nonfatal noattack Placebo 17.49 139.91 10942.61 Aspirin 17.51 140.09 10957.39 • p-value ≈ . 000006 • 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 .6 3.39-.41 Aspirin-.6-3.39 .41 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 indepen- dent of the Myocardial infarction. -Similarly for the seocond cell, 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.than the number we would 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