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 [20, 15, 21, 14]; Machine #2 measurements [ 17, 17, 16, 16]; Machine #3 measurements [ 15, 20, 24, 17]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits?

a. 34.67and 0.6667 b. 21.8and 13.53 c. 23.45and 11.89 d. 19.2and 16.14

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