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, 15, 15, 20); Machine #2 measurements [ 22, 12, 17, 21]; Machine #3 measurements [ 14, 20, 23, 20). Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 24.42and 12.25 O b. 26.83and 9.833 O c. 43.33and -6.667 O d. 20.58and 16.08

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