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Question 946:

The management of a mine wishes to investigate the effect of a 4-day workweek on absenteeism. 2 random sample of size 40 were selected. Employees of Group 1 worked 10-hour days (4day week) and Group 2 worked 8hour days (5 days a week). If Group 1 averaged 4 hours of absenteeism per week, with a standard deviation of 1.2 and Group 2 averaged 4.4 hours of absenteeism per week, with the standard deviation of 1.5, should we conclude that the shorter workweek reduces absenteeism? Test at a=0.05.

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