(a) Discuss the use of the moving range method to estimate the process standard deviation when the...
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(b) Discuss the use of the sample variance s2 with positively autocorrelated data. Specifically, if the observations at lag i have autocorrelation i, is s2 still an unbiased estimator for 2?
(c) Does your answer in part (b) imply that s2 would really be a good way (in practice) to estimate 2 in constructing a control chart for autocorrelated data?
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Introduction to Statistical Quality Control
ISBN: 978-1118146811
7th edition
Authors: Douglas C Montgomery
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