CENGAGENOW FOR ANDERSON/SWEENEY/WILLIAM
13th Edition
ISBN: 9781337094399
Author: Cochran
Publisher: IACCENGAGE
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Textbook Question
Chapter 18.2, Problem 14E
Percents of on-time arrivals for flights in the past two years were collected for 11 randomly selected airports. Data for these airports follow. Use α = .05 to test the hypothesis that there is no difference between the
| Percent On Time | ||
| Airport | Two Years Ago | Last Year |
| Boston Logan | 71.78 | 69.69 |
| Chicago O’Hare | 68.23 | 65.88 |
| Chicago Midway | 77.98 | 78.40 |
| Denver | 78.71 | 75.78 |
| Fort Lauderdale | 77.59 | 73.45 |
| Houston | 77.67 | 78.68 |
| Los Angeles | 76.67 | 76.38 |
| Miami | 76.29 | 70.98 |
| New York (JFK) | 69.39 | 62.84 |
| Orlando | 79.91 | 76.49 |
| Washington (Dulles) | 75.55 | 72.42 |
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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 18 Solutions
CENGAGENOW FOR ANDERSON/SWEENEY/WILLIAM
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