Posted by **Carolyn** on Thursday, December 6, 2012 at 9:59am.

A quality control inspector wants to estimate the mean inside diameter of the washers produced by a

certain machine. A preliminary sample indicates that the inside diameters have a standard deviation

of 0.30 millimeters. What sample size does he need to estimate the mean to within an error of E = 0.02

millimeters with 90% confidence?

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