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A quality analyst wants to construct a control chart for de machines all producing the same product are under contr particular quality variable Accordingly he

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A quality analyst wants to construct a control chart for de machines all producing the same product are under contr particular quality variable Accordingly he sampled four un machine with the following results Machine 1 2 3 17 16 23 5 4 2 0 Measurements 422 15 25 15 17 18 25 23 22 What is the estimate of the sample average range based u

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