np Chart

Appendix II Attribute Charts

Lesson A2-03

Text: Appendix II pages 18 – 20

Duration: 5 minutes

Introduction to np Charts

np charts look identical to p charts when n is constant (except for the scale). In fact, np charts can only be used when n is constant, even though p charts can be modified to handle changing sample sizes.

A np chart Minitab Example

Download the exercise data (and solution) within the file: attribute-p-chart-exercise.xlsx

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About Steven Wachs

Steven Wachs has 25 years of wide-ranging industry experience in both technical and management positions. Steve has worked as a statistician at Ford Motor Company where he has extensive experience in the development of statistical models, reliability analysis, designed experimentation, and statistical process control.