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 [19, 15, 12, 22]; Machine #2 measurements [ 24, 15, 22, 16); Machine #3 measurements [ 22, 21, 17, 18]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 24.42and 12.74 O b. 42.58and -5.417 Oc. 20.74and 16.42 O d. 26.74and 10.42

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