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 (all measurements in cm in length). It is known from previous experience, that the standard deviation of the process is 4 cm. 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?

23 and 20 2

5 and 21

23.29 and 16.71

26 and 20

24 and 20

22 and 18

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