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, 16, 15, 20], Machine # 2 measurements [ 24, 15, 24, 12]: Machine #3 measurements [ 19, 19, 21, 23]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? Oa 23.78and 13.56 Ob 20.56and 16.78 Oc 25.81and 11.53 Od 39.67and-2.333

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