Question: A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results:

Machine Measurements
#1 17 15 15 17
#2 16 25 18 25
#3 23 24 23 22

What are the x-bar chart three-sigma upper and lower control limits?

Select one:

A. 24 and 16

B. 22 and 18

C. 23.29 and 16.71

D. 23.16 and 16.84

E. 23.5 and 16.5

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