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 [23, 21, 15, 16]; Machine #2 measurements [ 22, 18, 19, 12); Machine #3 measurements [ 13, 17, 21, 22]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a 20.68and 15.82 O b. 24.82and 11.68 O c. 27.43and 9.07 O d. 45.25and -8.75

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