After incorporating the changes recommended by the expert, Basic Statistics

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After incorporating the changes recommended by the expert

Before the hiring of an efficiency expert, the mean productivity of a firm's employees was 45.4 units per hour, with a standard deviation of 4.5 units per hour.

After incorporating the changes recommended by the expert, it was found that a sample of 30 workers produced a mean of 47.5 units per hour. Using the 0.01 level of significance, can we conclude that the mean productivity has increased?

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Basic Statistics: After incorporating the changes recommended by the expert

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