Essentials of Business Analytics (MindTap Course List)
2nd Edition
ISBN: 9781305627734
Author: Jeffrey D. Camm, James J. Cochran, Michael J. Fry, Jeffrey W. Ohlmann, David R. Anderson
Publisher: Cengage Learning
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Chapter 7, Problem 12P
The National Football League (NFL) records a variety of performance data for individuals and teams. To investigate the importance of passing on the percentage of games won by a team, the following data show the conference (Conf), average number of passing yards per attempt (Yds/Att), the number of interceptions thrown per attempt (Int/Att), and the percentage of games won (Win%) for a random sample of 16 NFL teams for the 2011 season (NFL web site, February 12, 2012).
- a. Develop the estimated regression equation that could be used to predict the percentage of games won, given the average number of passing yards per attempt. What proportion of variation in the sample values of proportion of games won does this model explain?
- b. Develop the estimated regression equation that could be used to predict the percentage of games won, given the number of interceptions thrown per attempt. What proportion of variation in the sample values of proportion of games won does this model explain?
- c. Develop the estimated regression equation that could be used to predict the percentage of games won, given the average number of passing yards per attempt and the number of interceptions thrown per attempt. What proportion of variation in the sample values of proportion of games won does this model explain?
- d. The average number of passing yards per attempt for the Kansas City Chiefs during the 2011 season was 6.2, and the team’s number of interceptions thrown per attempt was 0.036. Use the estimated regression equation developed in part (c) to predict the percentage of games won by the Kansas City Chiefs during the 2011 season. Compare your prediction to the actual percentage of games won by the Kansas City Chiefs. (Note: For the 2011 season, the Kansas City Chiefs’ record was 7 wins and 9 losses.)
- e. Did the estimated regression equation that uses only the average number of passing yards per attempt as the independent variable to predict the percentage of games won provide a good fit?
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Excel File: data05-19.xls
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Select your answer
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Expected value
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For unemployed persons in the United States, the average number of months of unemployment at the end of December 2009 was approximately seven months (Bureau of Labor Statistics, January 2010). Suppose the following data are for a particular region in upstate New York. The values in the first column show the number of
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1
1029
2
1686
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2269
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2675
5
3487
6
4652
7
4145
8
3587
9
2325
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a. Use the data to develop an empirical discrete probability distribution for x (to 4 decimals).
(x)
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2
3
4
5
6
7
8
9
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b. Show that your probability distribution satisfies the conditions for a valid discrete probability distribution.
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Chapter 7 Solutions
Essentials of Business Analytics (MindTap Course List)
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Ch. 7 - The American Association of Individual Investors...Ch. 7 - The National Football League (NFL) records a...Ch. 7 - Johnson Filtration. Inc., provides maintenance...Ch. 7 - A study investigated the relationship between...Ch. 7 - The U.S. Department of Energys Fuel Economy Guide...Ch. 7 - A highway department is studying the relationship...Ch. 7 - A sample containing years to maturity and...Ch. 7 - In 2011, home prices and mortgage rates fell so...Ch. 7 - A recent 10-year study conducted by a research...Ch. 7 - The Scholastic Aptitude Test (or SAT) is a...Ch. 7 - Consider again the example introduced in Section...Ch. 7 - Alumni donations are an important source of...
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