The control limits for an X chart with n = 4 are 12.8 and 24.8, and the
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The control limits for an X̅ chart with n = 4 are 12.8 and 24.8, and the PCR for a measurement is 1.33.
(a) Estimate the process standard deviation σ.
(b) Calculate the specification limits. Assume that they are centered around the process mean.
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a 248 128 12 6 x Therefore Therefore x 4 b PCR U...View the full answer
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Related Book For 
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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