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 [12, 21, 18, 12]; Machine #2 measurements [ 15, 16, 20, 24); Machine #3 measurements [ 21, 16, 17, 24]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 26.84and 9.16 Ob 20.34and 15.66 O c. 44and -8 O d. 24.33and 11.67

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