Find minimum sample size to create confidence interval, Mathematics

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Find minimum sample size to create confidence interval

The machine cuts plastic into sheets which are 50 feet (600 inches) long. inches) long. Suppose that population of lengths is normally distributed. a. Company wishes to evaluate mean length machine is cutting plastic within 0.125 inch. Find minimum sample size required to create 90% confidence interval for population mean. Suppose poplulation standard deviation is .25 inch.

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