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 [21, 13, 12, 12]; Machine #2 measurements [ 16, 24, 19, 19]; Machine #3 measurements [ 17, 21, 12, 21]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 23.58and 10.92 O b. 43.25and -8.75 O c. 26.09and 8.41 O d. 19.59and 14.91

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