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, 22, 24, 18]; Machine #2 measurements [ 18, 22, 22, 13]; Machine #3 measurements [ 18, 23, 17, 14]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 21.28and 15.88 O b. 25.88and 11.28 . 48.58and -11.42 O d. 28.78and 8.383

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