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Control Chart: UCL, LCL and Standard Error

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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 standard errors or even one standard error? Explain.

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Solution Summary

A control chart is defined. The grand mean, UCL and LCL of a control chart are determined. Why +/-3 standard errors are used in control charts are examined.

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In statistical process control, the control chart, also known as the 'Shewhart chart' or 'process-behavior chart' is a tool used to determine whether a developing or business process is in a state of statistical control or not. If the chart indicates that the process is currently under control then it ...

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