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 Measirement 17 15 15 17

Machine 2 Measurement 16 25 18 25

Machine 3 Measurement 23 24 23 22

Using the factors for three sigma control limits, what are the x-bar chart upper and lower control limits?

Select one:

23.29 and 16.71

24.33 and 15.67

23.5 and 16.5

23.16 and 16.84

24.42 and 17.67

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