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

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 with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: Machine #1 #2 #3 What is the estimate of the sample average range based upon this limited sample? 5.4 2.0 Measurements 17 15 15 17 16 25 18 25 23 24 23 22 4.33 13.0 4.2
 NEED ASAP PLEASE A quality analyst wants to construct a 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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