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Unformatted text preview: . An insurance company estimates 45 percent of its claims have errors. The insurance
company wants to estimate with 99 percent confidence the proportion of claims with errors.
What sample size is needed if they wish to be within 5 percent of the actual?
A. 664
B. 657
C. 163
D. 1084 AACSB: Analytic
Bloom's: Application
Difficulty: Hard
Topic: Sample size determination for population proportion 116. In a randomly selected group of 650 automobile deaths, 180 were alcohol related.
Construct a 95 percent confidence interval for the true proportion of all automobile accidents
caused by alcohol.
A. [.243 .311]
B. [.262 .292]
C. [.259 .294]
D. [.263 .291] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population proportion 1698 Chapter 01  An Introduction to Business Statistics 117. You want to estimate the proportion of customers who are satisfied with their
supermarket at α = .10 and within .025 of the true value. It has been estimated that p = .85.
How large of a sample is needed?
A. 1083
B. 553
C. 71
D. 336 AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Sample size determination for population proportion 118. Find a 99 percent confidence interval for µ if
= 98.6, s = 2, and n = 5. Assume that
the sample is randomly selected from a normally distributed population.
A. [95.69 101.51]
B. [95.25 101.95]
C. [94.48 102.72]
D. [89.39 107.81] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population mean σ unknown 1699 Chapter 01  An Introduction to Business Statistics 119. The customer service manager for the XYZ Fastener Manufacturing Company examined
60 vouchers and found nine vouchers containing errors. Find a 98 percent confidence interval
for the proportion of vouchers with errors.
A. [.147 .153]
B. [.080 .220]
C. [.043 .257]
D. [.112 .188] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population proportion 120. The weight of a product is measured in pounds. A sample of 50 units is taken from a
batch. The sample yielded the following results:
= 75 lbs., but we know that σ2 = 100 lbs.
Calculate a 90 percent confidence interval for
.
A. [73.19 76.81]
B. [51.74 98.26]
C. [72.67 77.33]
D. [67.50 82.50] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population mean σ known 1700 Chapter 01  An Introduction to Business Statistics 121. The weight of a product is measured in pounds. A sample of 50 units is taken from a
batch. The sample yielded the following results:
= 75 lbs., but we know that σ2 = 100 lbs.
Calculate a 95 percent confidence interval for
.
A. [71.25 78.75]
B. [72.23 77.77]
C. [47.28 102.72]
D. [72.67 77.33] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population mean σ known 122. The weight of a product is measured in pounds. A sample of 50 units is taken from a
batch. The sample yielded the following results:
= 75 lbs., but we know that σ2 = 100 lbs.
Calculate a 99 percent confidence interval for
.
A. [71.36 78.64]
B. [74.25 75.75]
C. [38.58 111.42]
D. [71.71 78.29] AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population mean σ known 1701 Chapter 01  An Introduction to Business Statistics 123. The 95% confidence interval for the average weight of a product is from 72.23 lbs. to
77.77 lbs. Can we conclude that
= 77 using a 95 percent confidence interval?
A. Yes
B. No AACSB: Analytic
Bloom's: Analysis
Difficulty: Medium
Topic: Confidence interval for population mean 124. The 99% confidence interval for the average weight of a product is from 71.36 lbs. to
78.64 lbs. Can we conclude that
is equal to 71 using a 99 percent confidence interval?
Briefly explain.
A. Yes
B. No AACSB: Analytic
Bloom's: Analysis
Difficulty: Medium
Topic: Confidence interval for population mean 125. A sample of 2,000 people yielded
proportion?
A. .0056
B. .0112
C. .00012
D. .0161 = .52. What is the variance of the population AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population proportion 1702 Chapter 01  An Introduction to Business Statistics 126. A sample of 2,000 people yielded
for p.
A. [.506 .534]
B. [.468 .572]
C. [.511 .529]
D. [.502 .538] = .52. Calculate a 90 percent confidence interval AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population proportion 127. A sample of 2,000 people yielded
for p.
A. [.509 .531]
B. [.494 .546]
C. [.498 .542]
D. [.502 .538] = .52. Calculate a 95 percent confidence interval AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population proportion 1703 Chapter 01  An Introduction to Business Statistics 128. A sample of 2,000 people yielded
for p.
A. [.515 .525]
B. [.494 .546]
C. [.506 .534]
D. [.491 .549] = .52. Calculate a 99 percent confidence interval AACSB: Analytic
Bloom's: Application
Difficulty: Medium
Topic: Confidence interval for population proportion 129. A random sample of size 15 is taken from a population assumed to be normal, and
1.2 and s = 0.6. Calcul...
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 Winter '14

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