To determine the efficiency of a batch of production of, Basic Computer Science

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To determine the efficiency of a batch of production of

To determine the efficiency of a batch of production of electric motors, 8 motors are tested. The average efficiency of the sample is calculated to be 88.5% and the standard deviation of the sample is 0.5 percentage point.

(a) Determine a 95% confidence interval for the mean efficiency of the given batch of motors.

(b) If we want to cut the confidence interval to one third, how many more motors should be tested?

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