Question: 33) A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard

33) 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 [20, 22, 14, 12]; Machine #2 measurements [ 16, 13, 18, 19]; Machine #3 measurements [ 18, 15, 19, 16]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 18.63and 15.03 b. 21.7and 11.97 c. 36.83and -3.167 d. 23.63and 10.03

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