Statistics for Business & Economics, Revised (with XLSTAT Education Edition Printed Access Card)
13th Edition
ISBN: 9781337094160
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Textbook Question
Chapter 7.2, Problem 8E
The following stocks make up the Dow Jones Industrial Average (Barron’s, July 30, 2012).
- 1. 1.3M
- 2. AT&T
- 3. Alcoa
- 4. American Express
- 5. Bank of America
- 6. Boeing
- 7. Caterpillar
- 8. Chevron
- 9. Cisco Systems
- 10. Coca-Cola
- 11. Disney
- 12. DuPont
- 13. ExxonMobil
- 14. General Electric
- 15. Hewlett-Packard
- 16. Home Depot
- 17. IBM
- 18. Intel
- 19. Johnson & Johnson
- 20. Kraft Foods
- 21. McDonald’s
- 22. Merck
- 23. Microsoft
- 24. J.P. Morgan
- 25. Pfizer
- 26. Procter & Gamble
- 27. Travelers
- 28. United Technologies
- 29. Verizon
- 30. Wal-Mart
Suppose you would like to select a sample of six of these companies to conduct an in-depth study of management practices. Use the first two digits in each row of the ninth column of Table 7.1 to select a simple random sample of six companies.
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Suppose the Dow Jones Industrial Average went up 149.82 points. The following table shows the stock price changes for a sample of 12 companies on that day.
PRICE CHANGE
PRICE CHANGE
COMPANY
$
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$
AFLAC
0.81
JOHN&JOHN
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BANK AMERICA
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LOEWS CP
0.92
CABELVISION
0.41
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DIAGEO
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SMPRAENGY
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SUNOCO
0.52
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0.4
TYSON FOOD
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Provide 95% confidence interval estimates of the populatioin vairance and the population standard deviation.
3. Suppose that the Dow Jones Industrial Average went up 149.82 points. The following table
shows the stock price changes for a sample of 12 companies on that day.
Price Change
Price Change
Company
Company
John & John.
Aflac
Bank of America
0.81
0.05
1.46
0.92
Loews Cp
Nokia
0.21
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Cablevision
0.41
Diageo
Flour Cp
1.32
2.37
SmpraEngy
Sunoco
| Tyson Food
0.52
Goodrich
0.4
0.22
Provide 95% confidence interval estimates of the population variance and the population standard
deviation
. If a startup churns 5.6% of its customers each month, then what is the average lifetime of a customer in months?
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Chapter 7 Solutions
Statistics for Business & Economics, Revised (with XLSTAT Education Edition Printed Access Card)
Ch. 7.2 - Consider a finite population with five elements...Ch. 7.2 - Assume a finite population has 350 elements. Using...Ch. 7.2 - Fortune publishes data on sales, profits, assets,...Ch. 7.2 - The 10 most active stocks on the New York Stock...Ch. 7.2 - A student government organization is interested in...Ch. 7.2 - The County and City Data Book, published by the...Ch. 7.2 - Assume that we want to identify a simple random...Ch. 7.2 - The following stocks make up the Dow Jones...Ch. 7.2 - The Wall Street Journal provides the net asset...Ch. 7.2 - Indicate which of the following situations involve...
Ch. 7.3 - The following data are from a simple random...Ch. 7.3 - A survey question for a sample of 150 individuals...Ch. 7.3 - A sample of 5 months of sales data provided the...Ch. 7.3 - Morningstar publishes ratings data on 1208 company...Ch. 7.3 - The National Football League (NFL) polls fans to...Ch. 7.3 - A sample of 426 U.S. adults age 50 and older were...Ch. 7.3 - One of the questions in the Pew Internet American...Ch. 7.5 - A population has a mean of 200 and a standard...Ch. 7.5 - A population has a mean of 200 and a standard...Ch. 7.5 - Assume the population standard deviation is = 25....Ch. 7.5 - Suppose a random sample of size 50 is selected...Ch. 7.5 - Refer to the EAI sampling problem. Suppose a...Ch. 7.5 - In the EAI sampling problem (see Figure 7.5), we...Ch. 7.5 - Barrons reported that the average number of weeks...Ch. 7.5 - The College Board reported the following mean...Ch. 7.5 - For the year 2010, 33% of taxpayers with adjusted...Ch. 7.5 - The Economic Policy Institute periodically issues...Ch. 7.5 - The state of California has a mean annual rainfall...Ch. 7.5 - The mean preparation fee HR Block charged retail...Ch. 7.5 - To estimate the mean age for a population of 4000...Ch. 7.6 - A sample of size 100 is selected from a population...Ch. 7.6 - A population proportion is .40. A sample of size...Ch. 7.6 - Assume that the population proportion is .55....Ch. 7.6 - The population proportion is .30. What is the...Ch. 7.6 - The president of Doerman Distributors, Inc.,...Ch. 7.6 - The Wall Street Journal reported that the age at...Ch. 7.6 - People end up tossing 12% of what they buy at the...Ch. 7.6 - Forty-two percent of primary care doctors think...Ch. 7.6 - In 2008 the Better Business Bureau settled 75% of...Ch. 7.6 - The Grocery Manufacturers of America reported that...Ch. 7.6 - The Food Marketing Institute shows that 17% of...Ch. 7 - Jack Lawler, a financial analyst, wants to prepare...Ch. 7 - The latest available data showed health...Ch. 7 - Foot Locker uses sales per square foot as a...Ch. 7 - Allegiant Airlines charges a mean base fare of 89....Ch. 7 - After deducting grants based on need, the average...Ch. 7 - Three firms carry inventories that differ in size....Ch. 7 - A researcher reports survey results by stating...Ch. 7 - A production process is checked periodically by a...Ch. 7 - Fifteen percent of Australians smoke. By...Ch. 7 - A market research firm conducts telephone surveys...Ch. 7 - Advertisers contract with Internet service...Ch. 7 - The proportion of individuals insured by the...Ch. 7 - Lori Jeffrey is a successful sales representative...Ch. 7 - Managerial Report Prepare a managerial report that...
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