Airline Arrivals. The following table shows real arrival data for two airlines in five cities (airline names have been changed).
Destination | Excelsior Airlines | Paradise Airlines | ||
% On Time | Number of Arrivals | % On Time | Number of Arrivals | |
Los Angeles | 88.9 | 559 | 85.6 | 811 |
Phoenix | 94.8 | 233 | 92.1 | 5255 |
San Diego | 91.4 | 232 | 85.5 | 448 |
San Francisco | 83.1 | 605 | 71.3 | 449 |
Seattle | 85.8 | 2146 | 76.7 | 262 |
Total | 3775 | 7225 | ||
Source: Technical Review (1994), p. 3845.
a. Which airline has the higher percentage of on-time flights to the five cities?
b. Compute the percentage of on-time flights for the two airlines over all five cities.
c. Explain the apparent inconsistency in these results.
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