Statistics for Business & Economics, Revised (MindTap Course List)
12th Edition
ISBN: 9781285846323
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: South-Western College Pub
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Chapter 14, Problem 63SE
A sociologist was hired by a large city hospital to investigate the relationship between the number of unauthorized days that employees are absent per year and the distance (miles) between home and work for the employees. A sample of 10 employees was chosen, and the following data were collected.
| Distance to Work (miles) | Number of Days Absent |
| 1 | 8 |
| 3 | 5 |
| 4 | 8 |
| 6 | 7 |
| 8 | 6 |
| 10 | 3 |
| 12 | 5 |
| 14 | 2 |
| 14 | 4 |
| 18 | 2 |
- a. Develop a
scatter diagram for these data. Does a linear relationship appear reason able? Explain. - b. Develop the least squares estimated regression equation.
- c. Is there a significant relationship between the two variables? Use α = .05.
- d. Did the estimated regression equation provide a good fit? Explain.
- e. Use the estimated regression equation developed in part (b) to develop a 95% confidence interval for the expected number of days absent for employees living 5 miles from the company.
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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 for Business & Economics, Revised (MindTap Course List)
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