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Unformatted text preview: Chapter 11 TwoSample Tests of Hypothesis Chapter 11 TwoSample Tests of Hypothesis 1. a. Twotailed test b. Reject H o if z <  2.05 or z > 2.05 c. 2.59, found by d. Reject H o e. p = 0.0096, found by 2(0.5000 0.4952) 2. a. Onetailed test b. Reject H o c. 0.607 found by d. Fail to reject H o e. p = 0.2709, found by 0.5000 0.2291 3. Step 1: H o : 1 2 H 1 : 1 < 2 Step 2: The 0.05 significance level was chosen Step 3: Reject H o Step 4: 0.94, found by Step 5: Fail to reject H o . Babies using the Gibbs brand did not gain less weight. p = 0.1736 found by 0.5000 0.3264 4. Step 1: H o : c = p H 1 : c p Step 2: The 0.05 significance level was chosen Step 3: Reject H o Step 4: 1.53, found by Step 5: Fail to reject H o . There is no difference in the mean number of miles traveled per month. The pvalue is 0.126 found by 2(0.5000 0.4370) 111 Chapter 11  Two Sample Tests of Hypothesis 5. Twotailed test. Because we are trying to show a difference exists between two means. Reject H o if z <  2.58 or z > 2.58 2.66, found by Reject H o at the 0.01 level. There is a difference in the mean turnover rate. 6. H o : 1 2 H 1 : 1 > 2 If z > 2.05, reject H o . Reject the null. It is reasonable to conclude union nurses earn more. The pvalue is 0.0183. 7. a. H o is rejected if z > 1.65 b. 0.64, found by c. 1.61, found by d. H o is not rejected 8. a. H o is rejected if z <  1.96 or z > 1.96 b. 0.80, found by c. 2.70, found by d. H o is rejected 9. a. H o : 1 = 2 H 1 : 1 2 b. H o is rejected if z <  1.96 or z > 1.96 c. 112 Chapter 11 TwoSample Tests of Hypothesis d. 2.09, found by e. H o is rejected. The proportion infested is not the same in the two fields. 113 Chapter 11  Two Sample Tests of Hypothesis 10. a. H o : 1 2 H 1 : 1 < 2 b. H o is rejected if z <  1.65 c. 12.60, found by d. H o is rejected. The proportion of women who think men are thoughtful has declined. 11. H o : d r H 1 : d > r H o is rejected if z > 2.05 H o is not rejected. There is no difference in the proportion of Democrats and Republicans who favor lowering the standards. 12. H o : s = m H 1 : s m H o is rejected if z <  1.96 or z > 1.96 H o is not rejected. There is no difference in the proportion of married and single drivers who have accidents....
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This note was uploaded on 12/30/2010 for the course BUSS 202 taught by Professor Ritageutchian during the Three '10 term at Notre Dame AU.
 Three '10
 RitaGeutchian

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