An ergonomics consultant is engaged by a large consumer products company to see what they can do to increase productivity. The consultant recommends an €œemployee athlete€ program, encouraging every employee to devote 5 minutes an hour to physical activity. The company worries that the gains in productivity will be offset by the loss in time on the job. They€™d like to know if the program increases or decreases productivity. To measure it, they monitor a random sample of 145 employees who word process, measuring their hourly key strokes both before and after the program is instituted. Here are the data:

a) What are the null and alternative hypotheses?
b) What can you conclude? Explain.
c) Give a 95% confidence interval for the mean change in productivity (as measured by keystrokes per hour).

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Keystrokes per Hour Difference Before After (After Before) Mean 1534.2 1685 145 1556.9 1495 145 22.7 113.6 145 SD