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:
Formatted below as [ Machine #: Measurements ]
Machine 1: 17 15 15 17
Machine 2: 16 25 18 25
Machine 3: 23 24 23 22
What is the estimate of the mean of the sampling distribution for the sample mean?
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