Types of Control Charts


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Types of Control Charts

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Interpreting Control Charts

Control charts fall into two categories: Variable and Attribute Control Charts.

  • Variable data are data that can be measured on a continuous scale such as a thermometer, a weighing scale, or a tape rule.

  • Attribute data are data that are counted, for example, as good or defective, as possessing or not possessing a particular characteristic.

The type of control chart you use will depend on the type of data you are working with.

It is always preferable to use variable data.

  • Variable data will provide better information about the process than attribute data.

  • Additionally, variable data require fewer samples to draw meaningful conclusions.

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