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:

A Quality Analyst wants to construct a control

1A. What are the x-bar chart upper and lower control limits? 2A. For upper and lower control limits of 23.29 and 16.71, which machine(s), if any, appear(s) to have an out-of-control process mean? 3A. What are range chart upper and lower control limits?

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

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