Your analyses in Exercises 11.23 through 11.26 point to two restaurants, McDonald’s and Starbucks, as unusual in several respects. How influential are these restaurants? The following four exercises provide answers.
| Restaurant | Market share | Franchises | Company | Sales | Burger |
|---|---|---|---|---|---|
| McDonald’s | 22.69 | 12,477 | 1550 | 32.4 | 1 |
| Subway | 7.71 | 23,850 | 0 | 10.6 | 0 |
| Starbucks | 6.76 | 4424 | 6707 | 7.6 | 0 |
| Wendy’s | 5.48 | 5182 | 1394 | 8.3 | 1 |
| Burger King | 5.48 | 6380 | 873 | 8.6 | 1 |
| Taco Bell | 4.78 | 4389 | 1245 | 6.9 | 0 |
| Dunkin’ Donuts | 4.02 | 6746 | 26 | 6.0 | 0 |
| Pizza Hut | 3.63 | 7083 | 459 | 5.4 | 0 |
| Chik-fil-A | 2.93 | 1461 | 76 | 3.6 | 0 |
| KFC | 2.87 | 4275 | 780 | 4.7 | 0 |
| Panera Bread | 2.49 | 791 | 662 | 3.1 | 0 |
| Sonic | 2.42 | 3117 | 455 | 3.6 | 1 |
| Domino’s | 2.23 | 4479 | 450 | 3.3 | 0 |
| Jack in the Box | 1.98 | 1250 | 956 | 2.9 | 1 |
| Arby’s | 1.91 | 2505 | 1144 | 3.0 | 0 |
| Chipotle | 1.72 | 0 | 1084 | 1.8 | 0 |
11.27
Rerun Exercise 11.23 without the data for McDonald’s and Starbucks. Compare your results with what you obtained in that exercise.
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11.27
(a)
| Variable | Mean | Std Dev | Minimum | Lower Quartile | Median | Upper Quartile | Maximum |
|---|---|---|---|---|---|---|---|
| Share | 3.55 | 1.75 | 1.72 | 2.23 | 2.90 | 4.78 | 7.71 |
| Franchises | 5107.71 | 5848.92 | 0.00 | 1461.00 | 4332.00 | 6380.00 | 23850.00 |
| Company | 686.00 | 458.93 | 0.00 | 450.00 | 721.00 | 1084.00 | 1394.00 |
| Sales | 5.13 | 2.62 | 1.80 | 3.10 | 4.15 | 6.90 | 10.60 |
| Burger | 0.29 | 0.47 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 |
Taking out the two outliers fixed a lot of the outlier problems we saw earlier with the histograms. Subway still shows up as an outlier in the Franchise histogram; otherwise, we can now see the distributions of the other variables much better. (c) Share is somewhat right-skewed, but it has an outlier, Subway. Subway is also a huge outlier for Franchises, making it hard to tell the distribution of Franchises. Company is uniformly distributed. Sales looks roughly Normal with a small rightskew. Burger only has two possible values.