sol.hw10.stat3011 - Homework 10 Solutions Yicheng Kang...

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Unformatted text preview: Homework 10 Solutions Yicheng Kang December 2, 2010 Problem 10.25 Step 1 Quantitative response variables; Random samples from two independent groups with large sample size, 150 > 30 , 182 > 30. Step 2 H : 1 = 2 H a : 1 6 = 2 Step 3 t = x 1- x 2- se = 2 . 8- 1 . 6 . 36 = 3 . 30 Step 4 P-value: 0.001. Step 5 If the null hypothesis were true, the probability would be 0.001 of getting a test statistic at least as extreme as the value observed. We have strong evidence that there is a difference between mens and womens population mean HONC scores. The females seem to have a higher population mean HONC score than the males. Problem 10.26 t = 5 . 4- 3 . 9 p 3 . 5 2 / 74 + 3 . 6 2 / 71 = 2 . 54 1 . P-value: 0.012. If the null hypothesis were true, the probability would be 0.012 of getting a test statistic at least as extreme as the value observed. We have very strong evidence that there is a difference between mens and womens population mean HONC scores among those who were monthly smokers. The females seem to have a higher population mean HONC score than males do....
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sol.hw10.stat3011 - Homework 10 Solutions Yicheng Kang...

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