Question: Question 2: A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with

Question 2: 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, four units of output were sampled from each machine, with the following results:

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

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

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