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 [21, 12, 22, 22]; Machine #2 measurements [ 19, 17, 16, 22]; Machine #3 measurements [ 22, 15, 18, 12]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits?

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 [21, 12, 22, 22]; Machine #2 measurements [ 19, 17, 16, 22]; Machine #3 measurements [ 22, 15, 18, 12]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 27.01and 9.327 O b. 24.49and 11.84 O c. 44.17and -7.833 O d. 20.51 and 15.83

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