Bundle: Modern Business Statistics with Microsoft Office Excel, Loose-Leaf Version, 6th + MindTap Business Statistics, 2 terms (12 months) Printed Access Card
6th Edition
ISBN: 9781337589383
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Chapter 8.5, Problem 45E
According to the Census Bureau, 2,475,780 people are employed by the federal government in the United States (U.S. Census Bureau website, May 30, 2016). Suppose that a random sample of 3500 of these federal employees was selected and the number of sick hours each of these employees took last year was collected from an electronic personnel database. The data collected in this survey are provided in the DATAfile named FedSickHours. Based on historical data, the population standard deviation can be assumed to be known with σ = 5 34.5.
- a. What is the point estimate for the
mean number of sick hours taken by federal employees last year? - b. Using 99% confidence, what is the margin of error?
- c. Using the results from part (a) and part (b), develop the 99% confidence
interval estimate of the mean number of sick hours taken by federal employees last year. - d. If the mean sick hours federal employees took two years ago was 62.2, what would the confidence interval in part (c) lead you to conclude about last year?
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Chapter 8 Solutions
Bundle: Modern Business Statistics with Microsoft Office Excel, Loose-Leaf Version, 6th + MindTap Business Statistics, 2 terms (12 months) Printed Access Card
Ch. 8.1 - 1. A simple random sample of 40 items resulted in...Ch. 8.1 - 2. A simple random sample of 50 items from a...Ch. 8.1 - 3. A simple random sample of 60 items resulted in...Ch. 8.1 - 4. A 95% confidence interval for a population mean...Ch. 8.1 - 5. Data were collected on the amount spent by 64...Ch. 8.1 - Travel Taxes. In an attempt to assess total daily...Ch. 8.1 - The National Fire Protection Association reported...Ch. 8.1 - 8. Studies show that massage therapy has a variety...Ch. 8.1 - Prob. 9ECh. 8.1 - 10. Costs are rising for all kinds of medical...
Ch. 8.2 - For a t distribution with 16 degrees of freedom,...Ch. 8.2 - Find the t value(s) for each of the following...Ch. 8.2 - The following sample data are from a normal...Ch. 8.2 - 14. A simple random sample with n = 54 provided a...Ch. 8.2 - Prob. 15ECh. 8.2 - Years to Bond Maturity. A sample containing years...Ch. 8.2 - Quality Ratings of Airports. The International Air...Ch. 8.2 - Unemployment in Older Workers. Older people often...Ch. 8.2 - Prob. 19ECh. 8.2 - Automobile Insurance Premiums. The average annual...Ch. 8.2 - Telemedicine. Health insurers are beginning to...Ch. 8.2 - Prob. 22ECh. 8.3 - 23. How large a sample should be selected to...Ch. 8.3 - Prob. 24ECh. 8.3 - Prob. 25ECh. 8.3 - Prob. 26ECh. 8.3 - Annual starting salaries for college graduates...Ch. 8.3 - Prob. 28ECh. 8.3 - 29. Customers arrive at a movie theater at the...Ch. 8.3 - Prob. 30ECh. 8.4 - 31. A simple random sample of 400 individuals...Ch. 8.4 - 32. A simple random sample of 800 elements...Ch. 8.4 - Prob. 33ECh. 8.4 - 34. At 95% confidence, how large a sample should...Ch. 8.4 - The Pew Research Center conducted a survey of...Ch. 8.4 - 36. According to statistics reported on CNBC, a...Ch. 8.4 - 37. One of the questions on a survey of 1000...Ch. 8.4 - According to Thomson Financial, through last...Ch. 8.4 - The percentage of Texans not covered by health...Ch. 8.4 - For many years businesses have struggled with the...Ch. 8.4 - 41. Fewer young people are driving. In 1983, 87%...Ch. 8.4 - Prob. 42ECh. 8.4 - Prob. 43ECh. 8.5 - Suppose a sample of 10001 erroneous Federal income...Ch. 8.5 - According to the Census Bureau, 2,475,780 people...Ch. 8.5 - Prob. 46ECh. 8.5 - Prob. 47ECh. 8 - 44. A sample survey of 54 discount brokers showed...Ch. 8 - 45. A survey conducted by the American Automobile...Ch. 8 - 46. The 92 million Americans of age 50 and over...Ch. 8 - Russia has recently started a push for stronger...Ch. 8 - 48. The Health Care Cost Institute tracks health...Ch. 8 - GlobalWebIndex reports that American Internet...Ch. 8 - 50. Mileage tests are conducted for a particular...Ch. 8 - Prob. 55SECh. 8 - Prob. 56SECh. 8 - 53. The National Center for Education Statistics...Ch. 8 - Prob. 58SECh. 8 - 55. The Pew Research Center has conducted...Ch. 8 - 56. A survey of 750 likely voters in Ohio was...Ch. 8 - The 2003 Statistical Abstract of the United States...Ch. 8 - 58. A well-known bank credit card firm wishes to...Ch. 8 - The American Enterprise Institute (AEI) Public...Ch. 8 - Prob. 64SECh. 8 - case Problem 1 Young Professional Magazine
Young...Ch. 8 - Gulf Real Estate Properties
Gulf Real Estate...Ch. 8 - Metropolitan Research, Inc.
Metropolitan Research,...
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