To determine the efficiency of a batch of production of
Chapter , Problem 6.63(choose chapter or problem)
To determine the efficiency of a batch of production of electric motors, 10 motors are tested. The average efficiency of the sample is calculated to be 91.0%, and the standard deviation of the sample is 0.8 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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