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 [24, 17, 17, 19]; Machine #2 measurements [ 12, 13, 19, 13]; Machine #3 measurements [ 12, 19, 21, 21]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 40.25and -5.75 b. 19.32and 15.18 c. 25.07and 9.43 d. 22.85and 11.65

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