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 [12, 16, 13, 23]; Machine #2 measurements [ 23, 14, 21, 19]; Machine #3 measurements [ 24, 16, 13, 24]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 20.96 and 15.38 O b. 49.17and -12.83 O c. 28.71 and 7.627 O d. 25.71and 10.62

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