sol.hw11.stat3011 - Homework 11 Solutions Yicheng Kang...

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Unformatted text preview: Homework 11 Solutions Yicheng Kang December 11, 2010 Problem 11.8 > qchisq(.95,1) [1] 3.841459 > qchisq(.95,2) [1] 5.991465 > qchisq(.95,4) [1] 9.487729 > qchisq(.95,16) [1] 26.29623 > qchisq(.95,16) [1] 26.29623 Problem 11.10 (a) NH: Marital Happiness and Family Income are independent. AH: Marital Happiness and Family Income are NOT independent. (b) df = 4. 9.49. 1 (c) P-value= 0 . 0001828591 < . 05. The probability of getting this value or more extreme value is almost zero. (d) We may reject the null hypothesis in support of the alternative and conclude that there is strong evidence of assosciation of marital happiness and family income based on the significance level of 0.05. Table 1: Marital happiness and income Marital Happiness Income Not Pretty Very Total Above 6 115 256 337 Average 18 256 442 716 Below 13 136 155 304 Total 37 507 853 1397 Verify X 2 = (6- 37 337 / 1397) 2 37 337 / 1397 + + (115- 853 304 / 1397) 2 853 304 / 1397 = 22 . 2 Problem 11.17 (a) Table 2: Asprin and heart attacks...
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sol.hw11.stat3011 - Homework 11 Solutions Yicheng Kang...

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