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 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 [18, 15, 19, 14]; Machine #2 measurements [ 12, 23, 15, 20]; Machine #3 measurements [ 12, 17, 12, 15]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits?

a. 17.89and 14.11 b. 23.14and 8.86 c. 37and -5 d. 21.11and 10.89

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