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
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 Measurements Number1 17 15 15 17 Number2 16 25 18 25 Number3 23 24 23 22 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? machine Number 1 machine Number2 machine Number3 all of the machines none of the machines

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