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, 16, 23, 13]; Machine #2 measurements [ 16, 20, 19, 23]; Machine #3 measurements [ 20, 24, 18, 19]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 24.68and 13.49 O b. 42.08and -3.917 O c. 21.15and 17.01 O d. 26.9and 11.26

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