Question: A quality analyst wants to construct a control chart for de machines. all producing the same product, are under control with to particular quality variable.

A quality analyst wants to construct a control
A quality analyst wants to construct a control chart for de machines. all producing the same product, are under control with to particular quality variable. Accordingly, he sampled four units of no machine with the following results: Machame Measurements 15 15 17 16 25 18 25 23 24 23 22 What is the estimate of the sample average range based upon this limited ample? 5.33 6.33 4.33 3.33

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