Question: Q 10 A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with

Q 10
Q 10 A Quality Analyst wants to construct a
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, 20, 20, 22); Machine #2 measurements [ 14, 13, 13, 17); Machine #3 measurements [ 12, 13, 15, 15). Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 19.74and 12.26 O b. 18.68and 13.32 Oc 16.99 and 15.01 O d. 27and 5

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