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, 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

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

Multiple Choice

  • 23.29 and 16.71

  • 24.33 and 15.67

  • 24.42 and 17.67

  • 23.16 and 16.84

  • 23.5 and 16.5

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