Question: A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in 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 in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results. It is known from previous experience that the standard deviation of a typical machine is measured as 2.12: Machine Measurements #1 17 15 15 18 #2 16 25 18 25 #3 23 24 23 22 What are the x-bar chart three-sigma upper and lower control limits

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