Question: 26. A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard

26. 26. 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 [15, 12, 12, 15); Machine #2 measurements [ 24, 24, 18, 14); Machine #3 measurements [ 14, 20, 14, 18]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 18.38and 14.96 O b. 35.67and -2.333 O c. 21.29and 12.04 O d. 23.13and 10.21

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