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 [18, 22, 13, 23]; Machine #2 measurements [ 16, 17, 12, 19]; Machine #3 measurements [ 19, 13, 24, 19]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 45.92and -10.08 O b. 24.73and 11.1 O c. 27.44and 8.397 O d. 20.44and 15.4

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