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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 Pvalue: 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 . Pvalue: 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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This document was uploaded on 04/28/2011.
 Spring '11

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