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SME_8e_Ch_12_Section_3 - CHAPTER 12 SECTION 3 INFERENCE...

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1 CHAPTER 12 SECTION 3: INFERENCE ABOUT A POPULATION MULTIPLE CHOICE 80. Under what condition(s) does the test statistic for p have an approximate normal distribution? a. When np > 5. b. When np and np (1 - p ) are both > 5. c. When n > 30. d. When np and n (1 - p ) are both > 5. ANS: D PTS: 1 REF: SECTION 12.3 81. In selecting the sample size to estimate the population proportion p , if we have no knowledge of even the approximate values of the sample proportion p 8 , we: 82. The use of the standard normal distribution for constructing confidence interval estimate for the population proportion p requires: 83. Assuming that all necessary conditions are met, what needs to be changed in the formula p 8 ± t α p 8 (1 - p 8 ) / n so that we can use it to construct a (1 - α ) confidence interval estimate for the population proportion p ? 84. From a sample of 400 items, 14 are found to be defective. The point estimate of the population proportion defective will be: a. 14 b. 0.035 c. 28.57 d. 0.05 ANS: B PTS: 1 REF: SECTION 12.3
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2 85. After calculating the sample size needed to estimate a population proportion to within 0.04, your statistics professor told you the maximum allowable error must be reduced to just .01. If the original calculation led to a sample size of 800, the sample size will now have to be: 86. The width of a confidence interval estimate for a proportion will be: 87. When determining the sample size needed for a proportion for a given level of confidence and sampling error, the closer to 0.50 that p is estimated to be:
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