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Statistics Homework Solutions 115

# Statistics Homework Solutions 115 - 115 SECTION 5.1 Chapter...

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SECTION 5.1 115 Chapter 5 Section 5.1 1. (a) 1.96 (b) 2.33 (c) 2.57 or 2.58 (d) 1.28 3. The level is the proportion of samples for which the confidence interval will cover the true value. Therefore as the level goes up, the reliability goes up. This increase in reliability is obtained by increasing the width of the confidence interval. Therefore as the level goes up the precision goes down. 5. (a) X 6230, s 221, n 100, z 025 1 96. The confidence interval is 6230 1 96 221 100 , or 6186 7 6273 3 . (b) X 6230, s 221, n 100, z 005 2 58. The confidence interval is 6230 2 58 221 100 , or 6173 0 6287 0 . (c) X 6230,
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