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 [12, 20, 21, 16); Machine #2 measurements [ 12, 20, 20, 13); Machine #3 measurements [ 24, 19, 23, 14]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? . 27.01and 8.653 Ob 24.4and 11.26 O c. 20.26 and 15.4 Od 44.83and -9.167

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