An employer experimented with a f lexible four-day work week. For a year, the employer recorded the mileage driven by 11 field workers on an ordinary five-day work week. Then it changed to a f lexible four-day work week and recorded mileage for another year. The data are in the first 3 columns of the following table:

QUESTION: Do flexible schedules reduce mileage?

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Name 5-Day Mileage 4-Day Mileage Difference Rank of absolute differences Jeff 2798 2914 -116 2 Betty 7724 6112 1612 8 Roger 7505 6177 1328 7 Tom 838 1102 -264 3 Aimee 4592 3281 1311 6 Greg 8107 4997 3110 11 Larry G. 1228 1695 -467 5 Tad 8718 6606 2112 10 Larry M. 1097 1063 34 1 Leslie 8089 6392 1697 Lee 3807 3362 445 9 4