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

Machine

Measurements

#1

17

15

15

17

#2

16

25

18

25

#3

23

24

23

22

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