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 [16, 13, 19, 18]; Machine #2 measurements [ 16, 13, 16, 15); Machine #3 measurements [ 13, 19, 15, 20). Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 19.98and 12.19 b. 17.52 and 14.64 c. 32.08and 0.08333 d. 21.52 and 10.64

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