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# Assuming a normal distribution construct a 99 percent

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Unformatted text preview: 8 C. 17 D. 545 AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Sample size determination for population proportion 1-690 Chapter 01 - An Introduction to Business Statistics 101. What sample size is needed to estimate the proportion of highway speeders within 5 percent using a 90 percent confidence level? A. 385 B. 68 C. 271 D. 165 AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Sample size for population proportion 102. What sample size is needed to estimate with 95 percent confidence the mean intake of calcium within 20 units of the true mean if the intake is normal with a variance of 1900 units? A. 34,671 B. 187 C. 32 D. 19 AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Sample size determination for population mean 1-691 Chapter 01 - An Introduction to Business Statistics 103. A sample of 200 observations is taken. The mean is 31.7 and the standard deviation is 1.8. Form a 90 percent confidence interval for the population mean. A. [31.54 31.86] B. [28.74 34.66] C. [28.53 34.87] D. [31.49 31.91] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 104. Ten items of 100 are defective. Develop a 95 percent confidence interval for the population proportion of defectives. A. [.04 .16] B. [.09 .11] C. [.08 .12] D. [.02 .18] AACSB: Analytic Bloom's: Application Difficulty: Hard Topic: Confidence interval for population proportion 1-692 Chapter 01 - An Introduction to Business Statistics 105. What is a 95 percent confidence interval for µ when n = 10, Assume population normality. A. [26.44 44.76] B. [26.30 44.90] C. [33.02 38.18] D. [27.54 43.66] 35.6, and s = 13.0? AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 106. What is a 99.9 percent confidence interval for µ when n = 10, Assume population normality. A. [29.75 38.45] B. [31.48 36.72] C. [30.98 37.22] D. [29.56 38.64] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 1-693 = 34.1, and s = 3.0? Chapter 01 - An Introduction to Business Statistics 107. In a study of 265 subjects, the average score on the examination was 63.8 and s = 3.08. What is a 95 percent confidence for µ? A. [63.59 64.01] B. [57.76 69.84] C. [63.43 64.17] D. [63.56 64.04] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population mean σ unknown 108. Given the following test scores, find a 95 percent confidence interval for the population mean: 148, 154, 158, 160, 161, 162, 166, 170, 182, 195, 236. Assume population normality. A. [155.24 188.76] B. [168.64 175.36] C. [157.25 186.75] D. [116.41 227.59] AACSB: Analytic Bloom's: Application Difficulty: Hard Topic: Confidence interval for population mean σ unknown 1-694 Chapter 01 - An Introduction to Business Statistics 109. Find the 99 percent confidence interval for p when A. [.068 .332] B. [.097 .303] C. [.159 .241] D. [.147 .253] = .2, and n = 100. AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population proportion 110. Find a 98 percent confidence interval for p when A. [.206 .294] B. [.231 .269] C. [.228 .272] D. [.200 .300] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population proportion 1-695 = .25 and n = 400. Chapter 01 - An Introduction to Business Statistics 111. Find a 99 percent confidence interval for p when A. [.469 .551] B. [.490 .530] C. [.446 .574] D. [.235 .785] = .51 and n = 1,000. AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population proportion 112. In a survey of 400 people, 60 percent favor new zoning laws. Find a 95 percent confidence interval for the true proportion favoring new laws. A. [.570 .630] B. [.576 .624] C. [.552 .648] D. [.566 .634] AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Confidence interval for population proportion 1-696 Chapter 01 - An Introduction to Business Statistics 113. We want to estimate with 99 percent confidence the percentage of buyers of cars who are under 30 years of age. A margin of error of 5 percentage points is desired. What sample size is needed? In an earlier sample we found a 99 percent confidence interval of buyers under 30 years of age to be [.18 .27]. A. 104 B. 664 C. 392 D. 523 AACSB: Analytic Bloom's: Application Difficulty: Hard Topic: Sample size determination for population proportion 114. A cable TV company wants to estimate the percentage of cable boxes in use during an evening hour. An approximation is 20 percent. They want the estimate to be at the 90 percent confidence level and within 2 percent of the actual proportion. What sample size is needed? A. 22 B. 1692 C. 1537 D. 1083 AACSB: Analytic Bloom's: Application Difficulty: Medium Topic: Sample size determination for population proportion 1-697 Chapter 01 - An Introduction to Business Statistics 115...
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