EBK STATISTICS FOR BUSINESS & ECONOMICS
12th Edition
ISBN: 8220100460463
Author: Anderson
Publisher: CENGAGE L
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Chapter 9.8, Problem 59E
An automobile mileage study tested the following hypotheses.
| Hypothesis | Conclusion |
| H0: μ ≥ 25 mpg | Manufacturer’s claim supported |
| Ha: μ < 25 mpg | Manufacturer’s claim rejected; average mileage per gallon less than stated |
For σ = 3 and a .02 level of significance, what
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An automobile manufacturer claims that a particular model car averages 24 miles per gallon. A consumer group feels that the company is overestimating the mean miles per gallon and asks the Consumer Protection Agency to investigate. The CPA plans to take a random sample of 30 cars of this model, find the mean miles per gallon for these cars, and conduct a test to determine whether the mean is significantly less than 24 mpg. The hypotheses for the test are: H₀: µ=24 and Ha: µ < 24.State and describe the Type 1 and 2 errors.
One-Sample T:
Test of u = 34 vs not
34
%3D
Variable
Мean
StDev
SE Mean
T
P
16
35.274
1.783
а.
b.
0.012
c. How many degrees of freedom are there on the t- test statistic?
d. At what level of significance can the null hypothesis be rejected?
e. If the alternative hypothesis is µ > 34, would the P-value have been larger or smaller?
v a.
a. P-value would be smaller
v b.
b. 15
v C.
с. 11.43
v d.
d. 2.8581
е.
e. 0.4458
f. P-value = 0.012
We reject the null hypothesis if the P-value
An automobile mileage study tested the following hypotheses.
Hypothesis
Conclusion
Ho: 4 2 25 mpg Manufacturer's claim supported
Hạ: µ < 25 mpg
Manufacturer's claim rejected;
average mileage per gallon less than stated
For o = 3 and a .02 level of significance, what sample size would be recommended if the researcher wants an 80% chance of
detecting that u is less than 25 miles per gallon when it is actually 24 (to the next whole number)?
Chapter 9 Solutions
EBK STATISTICS FOR BUSINESS & ECONOMICS
Ch. 9.1 - The manager of the Danvers-Hilton Resort Hotel...Ch. 9.1 - The manager of an automobile dealership is...Ch. 9.1 - A production line operation is designed to fill...Ch. 9.1 - Because of high production-changeover time and...Ch. 9.2 - Duke Energy reported that the cost of electricity...Ch. 9.2 - The label on a 3-quart container of orange juice...Ch. 9.2 - Carpetland salespersons average 8000 per week in...Ch. 9.2 - Suppose a new production method will be...Ch. 9.3 - consider the following hypothesis test: H0: 20...Ch. 9.3 - Consider the following hypothesis test: H0: 25...
Ch. 9.3 - Consider the following hypothesis test: H0: = 15...Ch. 9.3 - Consider the following hypothesis test: H0: 80...Ch. 9.3 - Consider the following hypothesis test: H0: 50...Ch. 9.3 - Consider the following hypothesis test: H0: = 22...Ch. 9.3 - Individuals filing federal income tax returns...Ch. 9.3 - In a study entitled How Undergraduate Students Use...Ch. 9.3 - The mean hourly wage for employees in...Ch. 9.3 - The average annual total return for U.S....Ch. 9.3 - The Internal Revenue Service (IRS) provides a...Ch. 9.3 - For the United States, the mean monthly Internet...Ch. 9.3 - Fowle Marketing Research, Inc., bases charges to a...Ch. 9.3 - CCN and ActMedia provided a television channel...Ch. 9.4 - Consider the following hypothesis test: H0: 12...Ch. 9.4 - Consider the following hypothesis test: H0: = 18...Ch. 9.4 - Consider the following hypothesis test: H0: 45...Ch. 9.4 - Consider the following hypothesis test: H0: = 100...Ch. 9.4 - The Employment and Training Administration...Ch. 9.4 - A shareholders group, in lodging a protest,...Ch. 9.4 - The national mean annual salary for a school...Ch. 9.4 - The time married men with children spend on child...Ch. 9.4 - The Coca-Cola Company reported that the mean per...Ch. 9.4 - According to the National Automobile Dealers...Ch. 9.4 - Annual per capita consumption of milk is 21.6...Ch. 9.4 - Joans Nursery specializes in custom-designed...Ch. 9.5 - Consider the following hypothesis test: H0: p =...Ch. 9.5 - Consider the following hypothesis test: H0: p .75...Ch. 9.5 - A study found that, in 2005, 12.5% of U.S. workers...Ch. 9.5 - A study by Consumer Reports showed that 64% of...Ch. 9.5 - According to the Pew Internet American Life...Ch. 9.5 - In 2008, 46% of business owners gave a holiday...Ch. 9.5 - Speaking to a group of analysts in January 2006, a...Ch. 9.5 - According to the University of Nevada Center for...Ch. 9.5 - Eagle Outfitters is a chain of stores specializing...Ch. 9.5 - In a cover story, BusinessWeek published...Ch. 9.5 - Many investors and financial analysts believe the...Ch. 9.7 - consider the following hypothesis test. H0: 10...Ch. 9.7 - Consider the following hypothesis test. H0: = 20...Ch. 9.7 - Fowle Marketing Research, Inc., bases charges to a...Ch. 9.7 - A consumer research group is interested in testing...Ch. 9.7 - Young Adult magazine states the following...Ch. 9.7 - A production line operation is tested for filling...Ch. 9.7 - Refer to exercise 48. Assume the firm selects a...Ch. 9.7 - Sparr Investments, Inc., specializes in...Ch. 9.8 - Consider the following hypothesis test. H0: 10...Ch. 9.8 - Consider the following hypothesis test. H0: = 20...Ch. 9.8 - Suppose the project director for the Hilltop...Ch. 9.8 - A special industrial battery must have a life of...Ch. 9.8 - Young Adult magazine states the following...Ch. 9.8 - An automobile mileage study tested the following...Ch. 9 - A production line operates with a mean filling...Ch. 9 - At Western University the historical mean of...Ch. 9 - Prob. 62SECh. 9 - On Friday, Wall Street traders were anxiously...Ch. 9 - Data released by the National Center for Health...Ch. 9 - A recent issue of the AARP Bulletin reported that...Ch. 9 - The chamber of commerce of a Florida Gulf coast...Ch. 9 - In Hamilton County, Ohio, the mean number of days...Ch. 9 - On December 25, 2009, an airline passenger was...Ch. 9 - An airline promotion to business travelers is...Ch. 9 - Virtual call centers are staffed by individuals...Ch. 9 - During the 2004 election year, new polling results...Ch. 9 - A radio station in Myrtle Beach announced that at...Ch. 9 - Prob. 73SECh. 9 - Shorney Construction Company bids on projects...Ch. 9 - A federal funding program is available to...Ch. 9 - H0: = 120 and Ha: 120 are used to test whether...Ch. 9 - Quality Associates, Inc. Quality Associates, Inc.,...Ch. 9 - Ethical Behavior of Business Students at Bayview...
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