Multiple Choice
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: 
Using the factors for three sigma control limits,what are the x-bar chart upper and lower control limits?
A) 24.33 and 15.67
B) 23.29 and 16.71
C) 23.5 and 16.5
D) 23.16 and 16.84
E) 24.42 and 17.67
Correct Answer:
Verified
Correct Answer:
Verified
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