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 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, 24, 14, 14]; Machine #2 measurements [ 14, 20, 15, 21]; Machine #3 measurements [ 19, 20, 22, 15]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 23.59and 11.91 b. 41.75and -6.25 c. 19.91and 15.59 d. 25.91and 9.59

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