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 [12, 24, 21, 16); Machine #2 measurements [ 22, 19, 16, 18]; Machine #3 measurements [ 21, 12, 14, 19]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 27.01and 8.653 O b. 24.4 and 11.26 O c. 44.83and -9.167 O d. 20.26 and 15.4

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