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 [22, 21, 16, 15]; Machine #2 measurements [ 13, 23, 24, 12]; Machine #3 measurements [ 19, 21, 17, 23]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 21.08and 16.58 O b. 43.83and -6.167 O c. 27.33and 10.33 O d. 24.92and 12.75

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