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# sol4 - STAT 426 HW4 1(2.21 Let u =(1 2 3 for women's...

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STAT 426 HW4. 1. (2.21) Let u = (1 , 2 , 3) for women’s attitudes (not likely, somewhat likely, very likely), and v = (0 , 2 , 1) for mammography experience (never, over one year ago, within the past year). From hw3, we know that 22% cells have expected counts less than 5; there- fore, we prefer Fisher’s Exact test to the Chi-Square test. From SAS output, p-value= 2 . 52 × 10 - 5 . Therefore, mammography experi- ence and women’s attitudes are associated. The standardized residuals are Not likely Somewhat likely Very likely Never 1.35 3.96 -4.67 > 1 year 0.48 -0.84 0.58 1 year -1.96 -3.76 4.00 Women who think it is very likely a mammogram will find breast cancer are more likely to have had an examination, whereas those who think the examination is only somewhat effective or not very effective are more likely not to have had an examination. 2. (2.25) Let θ be the ratio of the odds of cancer controlled by surgery to the odds of cancer controlled by radiation therapy. p-value= 23 m =21 parenleftBig 23 m parenrightBigparenleftBig 18 36 - m parenrightBig parenleftBig 41 36

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sol4 - STAT 426 HW4 1(2.21 Let u =(1 2 3 for women's...

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