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 [14, 23, 24, 19]: Machine # 2 measurements [ 24, 18, 18, 12); Machine #3 measurements [22, 19, 17, 20]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 28.35and 9.987 O b. 46.17and -7.833 Oc. 25.74and 12.6 Od. 21.6and 16.74

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