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 [23, 13, 15, 20]; Machine #2 measurements [ 19, 13, 13, 23]; Machine #3 measurements [ 16, 19, 14, 13]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 25.59and 7.91 O b. 42.75and -9.25 . 23.08and 10.42 O d. 19.09and 14.41

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