the accompanying data are the length

timer Asked: Feb 22nd, 2016

Question description

A machine cuts plastic into sheets that are 30 feet long. Assume that population of lengths is normally distributed. The company wants to estimate the mean length the machine is cutting the plastic within .25 inches. Determine the minimal sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is .50 inches. Which error tolerance requires a larger sample size and why?

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