sol3 - Solutions to STAT 426 HW3(provided by TA 1 Computer...

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Solutions to STAT 426 HW3 (provided by TA) 1. Computer usage Age Yes No Percentage of Yes young (20-30) 130 100 56.52 middle (30-50) 30 70 30 senior ( > 50) 45 125 26.47 (1) χ 2 = 42 . 745, p-value < 0 . 0001. We reject the hypothesis of independence between age and computer usage. (2) We observe a decreasing trend in the proportion of computer usage due to increasing age (from 56 . 52% to 26 . 47%). The Cochran-Armitage test supports the trend hypothesis. Z= - 6 . 1963 , p- value < 0 . 0001. The small left-sided p-value indicates that the proportion of computer usage decreases as age increases. The small two-sided p-value indicates that the proportion of usage either increases or decreases as age increases. 2. Let u = (1 , 2 , 3) for women’s attitudes (not likely, somewhat likely, very likely), and v = (0 , 1 , 2) for mammography experience (never, over one year ago, within the past year). G

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sol3 - Solutions to STAT 426 HW3(provided by TA 1 Computer...

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