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Control charts: Does your data represent a process that is stable and in control?
Control charts are the best way to learn how a process is running. They are used to reduce the chance of making one of two kinds of mistakes:
- Overcontrolling
Also called a Type I error, this refers to adjusting the process when nothing out of the ordinary has occurred.
- Undercontrolling
Also called a Type II error, this refers to the failure to adjust the process when something out of the ordinary has occurred
If you are not sure which chart to use for your data, review the brief descriptions on SPC Analysis Tools.
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