# ch_8 - Chapter 9 Form A Dual Population 1 Two types of...

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Chapter 9 Form A Dual Population 1. Two types of standardized tests are tested for their validity and sample results are given below. Use a 0.02 significance level to test the claim that the two tests have the same average validity. Brand X Brand Y ________________________ n = 25 n = 22 Conclusion:________________________ 2 . 49 = x 3 . 38 = x s = 1.5 s = 2.4 ________________________ 2. Two types of dial-up Internet services are tested for their speed and sample results are given below. Use a 0.06 significance level to test the claim that the two tests have different average validity. Brand X Brand Y ________________________ n = 100 n = 120 Conclusion:__________________ 2 . 60 = x 8 . 49 = x s = 2.9 s = 3.1 ________________________

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3. A radio station manager conducts an audience survey and finds that among 275 men surveyed, 18 were listeners, while there were 31 listeners among the 325 women surveyed. At the 0.05 significance level, test the claim that the proportions of male and female listeners are the same. ________________________ Conclusion:________________________
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ch_8 - Chapter 9 Form A Dual Population 1 Two types of...

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