Question: 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 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: Machine 15 18 #1 #2 #3 Measurements 17 14 15 25 23 25 18 26 21 23 What is the sample average range based upon this limited sample? O 4.0 6.33 0 7.4 08.0 8.33

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