<PRE><B>Question 324244</B>
the bolt must meet the specificatin of being within 2 millimeters of the standard deviation of 6 millimeters. determine the minimum required sample size to be tested if you want to be 95% confident.
using formula n=(z*c0/E)^2
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z for 95% = 1.96
Co is the standard deviation = 6 mm
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E is the error allowed = 2 mm
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So, n = [1.96*6/2]^2 = [1.96*3]^2 = 34 when rounded up
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Cheers,
Stan H. 
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