The following are the average weekly losses of work-hours due to accidents in 10 industrial plants before and after a certain safety program was put into operation:45 and 36, 73 and 60, 46 and 44, 124 and 119, 33 and 35,57 and 51, 83 and 77, 34 and 29, 26 and 24, and 17 and 11 Use the four steps in the initial part of Section 1 and the 0.05 level of significance to test whether the safety pro-gram is effective.

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