23 May In Tough Economic Times, The Business Staff At
| 10.23 In tough economic times, the business staff at | |
| magazines are challenged to sell advertising space in their | |
| publications. Thus, one indicator of a weak economy is the | |
| decline in the number of “ad pages” that magazines have | |
| sold. The file contains the number of ad pages | |
| found in the May 2008 and May 2009 issues of 12 men’s | |
| magazines. (Data extracted from W. Levith, “Magazine | |
| Monitor,” Mediaweek, April 20, 2009, p. 53.) | |
| a. At the 0.05 level of significance, is there evidence that | |
| the mean number of ad pages was higher in May 2008 | |
| than in May 2009? | |
| b. What assumption is necessary about the population | |
| distribution in order to perform this test? | |
| c. Use a graphical method to evaluate the validity of the | |
| assumption in (b). | |
| d. Construct and interpret a 95% confidence interval | |
| estimate of the difference in the mean number of ad pages | |
| in men’s magazines between May 2008 and May 2009. |
| Magazine | 2008 | 2009 |
| Details | 72.31 | 48.42 |
| Esquire | 66.69 | 42.79 |
| Field & Stream | 48.65 | 42.82 |
| Flex | 219.61 | 231.58 |
| GQ | 99.21 | 60.35 |
| Maxim | 68.5 | 41.82 |
| Men’s Fitness | 99.43 | 67.63 |
| Men’s Health | 90.88 | 74.45 |
| Men’s Journal | 183.1 | 88.34 |
| Mucscle & Fitness | 169.63 | 198.93 |
| Outdoor Life | 41.39 | 30.16 |
| Outside | 126.97 | 103.58 |
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