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For a statistical process control of a certain dimension x, QC periodically checks a sample of n=4 product units. The sample average x-bar fluctuates at

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For a statistical process control of a certain dimension x, QC periodically checks a sample of n=4 product units. The sample average x-bar fluctuates at random between 5.82 and 15.52 with an overall average of X=10.79. Is the process mean pstable for the average? Why or why not

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