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 #1 measurements [17, 24, 17, 12]; Machine #2 measurements [ 12, 24, 13, 18]; Machine #3 measurements [ 13, 15, 22, 20]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 25.28and 9.22 O b. 50.25and -15.75 O c. 28.47 and 6.03 O d. 20.22and 14.28

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