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An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in that same city. Samples were taken on two occasions, Sept. 1,2001 and Sept. 1, 2004.

City	Sept 1, 2001	Sept. 1, 2004
Wooster	1.8	1.7
Midland	2.0	2.0
Beaumont	22	2.5
Mara:bester	1.9	1.7

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