Question: points Save Answer Before hiring an efficiency expert, the mean productivity of a firm's employees was 45.4 units per hour with standard deviation of 4,5

points Save Answer Before hiring an efficiency expert, the mean productivity of a firm's employees was 45.4 units per hour with standard deviation of 4,5 units per hour. After incorporating changes recommended by the expert, it was found that a random sample of 30 workers produced a mean of 47.5 units per hour. At.01 level of significance can we conclude the mean productivity has increased ? Show all formulas used, calculations and results. Do on Blk Bd For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).

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