STATISTICS F/BUSINESS+ECONOMICS-TEXT
13th Edition
ISBN: 9781305881884
Author: Anderson
Publisher: CENGAGE L
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Textbook Question
Chapter 14.5, Problem 30E
Refer to exercise 9, where the following data were used to investigate the relationship between the number of cars in service (1000s) and the annual revenue ($ millions) for six smaller car rental companies (Auto Rental News website, August 7, 2012).
| Company | Cars (1000s) | Revenue ($ millions) |
| U-Save Auto Rental System, Inc. | 11.5 | 118 |
| Payless Car Rental System, Inc. | 10.0 | 135 |
| ACE Rent A Car | 9.0 | 100 |
| Rent-A-Wreck of America | 5.5 | 37 |
| Triangle Rent-A-Car | 4.2 | 40 |
| Affordable/Sensible | 3.3 | 32 |
With x = cars in service (1000s) and y = annual revenue ($ millions), the estimated regression equation is ŷ = −17.005 + 12.966x. For these data SSE = 1043.03 and SST = 10,568. Do these results indicate a significant relationship between the number of cars in service and the annual revenue?
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9.2 Testing the Mean mu:
Problem 3
(1 point)
Test the claim that the population of sophomore college
students has a mean grade point average greater than 2.2.
Sample statistics include n = 71, x = 2.44, and s = 0.9.
Use a significance level of a = 0.01.
The test statistic is
The P-Value is between :
The final conclusion is
< P-value <
A. There is sufficient evidence to support the claim that
the mean grade point average is greater than 2.2.
○ B. There is not sufficient evidence to support the claim
that the mean grade point average is greater than 2.2.
Note: You can earn partial credit on this problem.
Note: You are in the Reduced Scoring Period. All work counts for
50% of the original.
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Chapter 14 Solutions
STATISTICS F/BUSINESS+ECONOMICS-TEXT
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