SIX SIGMA Glossary: np Control Charts

np Control charts are attribute type charts used to plot units nonconforming when samples of equal size are taken from the process. The control limits are:

Upper Control Limit
Lower Control Limit

If the samples sizes are not of equal size a p control chart can be used.

The selection, design and use of control charts is covered in the MiC Quality courses Statistical Process Control and Advanced Statistical Process Control.

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