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    Control Chart: Grand mean, the UCL, the LCL

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    What is a control chart? What are the grand mean, the UCL, and the LCL of a control chart for the mean? Why do you suppose ±3 standard errors are used in control charts and not two or even one standard error? Explain.

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    https://brainmass.com/statistics/control-chart/control-chart-grand-mean-the-ucl-the-lcl-347033

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