Suppose you want to estimate, with 95% confidence, the population mean force required to break an insulator to within +/- 25 pounds.

Suppose you want to estimate, with 95% confidence, the population mean force required to break an insulator to within +/- 25 pounds. On the basis of a study conducted the previous year, you believe that the standard deviation is 100 pounds. Determine the sample size needed.

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