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 [18, 23, 23, 15); Machine #2 measurements [ 13, 12, 22, 22]; Machine #3 measurements [ 16, 24, 15, 15]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 24.74and 11.6 b. 27.35and 8.987 C. 45.17and -8.833 d. 20.6and 15.74

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