Question: NEED ASAP PLEASE A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control
A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: What is the estimate of the sample average range based upon this limited sample? 5.4 5.0 4.33 13.0 4.2
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