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 [15, 21, 18, 17]; Machine #2 measurements [ 22, 16, 14, 19]; Machine #3 measurements [ 12, 22, 18, 15]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 41.42and -6.583 b. 23.26and 11.58 C. 19.58and 15.26 O d. 25.58and 9.257

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