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Statistics Homework Solutions 121

# Statistics Homework Solutions 121 - 121 SECTION 5.3(c Let n...

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SECTION 5.3 121 (c) Let n be the required sample size. Then n satisfies the equation 0 05 1 96 ˜ p 1 ˜ p n 4 . Replacing ˜ p with 0 21154 and solving for n yields n 253. 15. (a) X 61, n 189, ˜ p 61 2 189 4 0 32642, z 05 1 645. The confidence interval is 0 32642 1 645 0 32642 1 0 32642 189 4 , or (0.271, 0.382). (b) Let n be the required sample size. Then n satisfies the equation 0 03 1 645 ˜ p 1 ˜ p n 4 . Replacing ˜ p with 0 32642 and solving for n yields n 658. (c) Let
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