What is a control chart?
Why do you suppose +/-3 standard errors are used in control charts and not two standard errors or even one standard error? Explain.© BrainMass Inc. brainmass.com June 3, 2020, 10:28 pm ad1c9bdddf
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 ...
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.