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 [19, 21, 22, 23]; Machine #2 measurements [ 17, 15, 12, 24]; Machine #3 measurements [ 16, 19, 22, 12]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 44.5and -7.5 O b. 20.84and 16.16 c. 24.83and 12.17 O d. 27.34and 9.66

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