Question:
A large number of workers commute to work at the Honda assembly plant in Alliston, Ontario, every day. The commute can be quite long, depending on traffic conditions. Suppose the company decided to experiment with flexible hours for office workers at the plant. A random sample of these workers was asked to precisely time (in minutes) how long their drive to work took, over a random sample of days. On half of those days, the workers were to leave home to arrive for an 8 A.M. start, on the other half they were to arrive for a 9 A.M. start. The average commuting time for each worker was recorded for each start time, and the results are shown below in Exhibit 9.51. Is there evidence, at a 4% significance level, that the earlier arrival time reduces the time it takes for workers to commute to work?
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8:00 A.M. Start9:00AM. Start 23 15 64 113 89 102 65 80 90 67 95 79 100 100 113 90 116 76 94 74 76 72 91 85 93 101 105 91 62 80 57 73 67 70 86 68 80 54 93 83 58 86 74 67 58 89 70 50 76 82 52 68