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 [22, 15, 24, 14], Machine #2 measurements [ 15, 13, 21, 19], Machine #3 measurements [ 22, 13, 19, 14]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? . 20.01and 15.15 Ob 24.15and 11.01 . O c. 44.58and -9.417 Od 26.76and 8.403

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