STATISTICS F/BUSINESS+ECONOMICS-TEXT
13th Edition
ISBN: 9781305881884
Author: Anderson
Publisher: CENGAGE L
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Chapter 14, Problem 60SE
One of the biggest changes in higher education in recent years has been the growth of online universities. The Online Education Database is an independent organization whose mission is to build a comprehensive list of the top accredited online colleges. The following table shows the retention rate (%) and the graduation rate (%) for 29 online colleges.
| Retention Rate (%) |
Graduation Rate (%) |
| 7 | 25 |
| 51 | 25 |
| 4 | 28 |
| 29 | 32 |
| 33 | 33 |
| 47 | 33 |
| 63 | 34 |
| 45 | 36 |
| 60 | 36 |
| 62 | 36 |
| 67 | 36 |
| 65 | 37 |
| 78 | 37 |
| 75 | 38 |
| 54 | 39 |
| 45 | 41 |
| 38 | 44 |
| 51 | 45 |
| 69 | 46 |
| 60 | 47 |
| 37 | 48 |
| 63 | 50 |
| 73 | 51 |
| 78 | 52 |
| 48 | 53 |
| 95 | 55 |
| 68 | 56 |
| 100 | 57 |
| 100 | 61 |
- a. Develop a
scatter diagram with retention rate as the independent variable. What does the scatter diagram indicate about the relationship between the two variables? - b. Develop the estimated regression equation.
- c. Test for a significant relationship. Use α = .05.
- d. Did the estimated regression equation provide a good fit?
- e. Suppose you were the president of South University. After reviewing the results, would you have any concerns about the performance of your university as compared to other online universities?
- f. Suppose you were the president of the University of Phoenix. After reviewing the results, would you have any concerns about the performance of your university as compared to other online universities?
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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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