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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: What is the estimate of the mean of the sampling distribution for the sample mean? Multiple Choice 23 19 21 16 20
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