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 [21, 18, 15, 20]; Machine #2 measurements [ 17, 23, 14, 23]; Machine #3 measurements [ 17, 13, 14, 15]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 19.21and 15.79 b. 23.96and 11.04 c. 36.5and -1.5 d. 22.12and 12.88

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