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 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:

A Quality Analyst wants to construct a control

What is the estimate of the process mean for whenever it is under control?

What is the sample average range based upon this limited sample?

What are the x-bar chart upper and lower control limits?

Machine #1 #2 #3 17 16 23 Measurements 15 15 17 25 18 25 24 23 22

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