11.23 Data analysis: Individual variables.
Table 11.3 gives data on the current fast-food market share, along with the number of franchises, number of company-owned stores, annual sales ($ million) from three years ago, and whether it is a burger restaurant.7 Market share is expressed in percents, based on current U.S. sales.
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11.23
(a)
Variable | Mean | Std Dev | Minimum | Lower Quartile | Median | Upper Quartile | Maximum |
---|---|---|---|---|---|---|---|
Share | 4.94 | 5.07 | 1.72 | 2.33 | 3.28 | 5.48 | 22.69 |
Franchises | 5525.56 | 5754.47 | 0.00 | 1983.00 | 4406.50 | 6563.00 | 23850.00 |
Company | 1116.31 | 1565.77 | 0.00 | 452.50 | 826.50 | 1194.50 | 6707.00 |
Sales | 6.99 | 7.23 | 1.80 | 3.20 | 5.05 | 7.95 | 32.40 |
Burger | 0.31 | 0.48 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 |
(c) McDonald’s is an outlier for Share and Sales, Subway is an outlier for Franchises, and Starbucks is an outlier for Company. Otherwise, it is hard to tell the distributions of the other restaurants because they are being squished on the histograms because of the outliers. Burger also only has two possible values.