(A)What Sample Size Would Be Required for the Production Personnel

question 63

Essay

(A)What sample size would be required for the production personnel to be approximately 95% sure that their estimate of the average number of defective batteries per box is within 0.3 unit of the true mean? Assume that the best estimate of the population standard deviation ( )is 0.9 defective batteries per box.
(B)How does your answer to (A)change if the production personnel want their estimate to be within 0.5 unit of the actual population mean? Evaluate the tradeoff between required accuracy and sample size requirement for this case and the case in (A).

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