Standardized Charts

Appendix II Attribute Charts

Lesson A2-06

Text: Appendix II pages 30 – 38

Duration: 14 minutes

Introduction to Standardized Charts

When the sample size fluctuates by more than plus or minus 20% of the average sample size, standardized charts should be used to account for the varying size. Consider how the situation of varying sample size may arise, and also observe its adverse consequence if not properly accounted for.

p Chart Standardization

Standardized p Chart Example

Download the spreadsheet for computing standardized p or u charts: standardized-p-and-u-charts-calculations.xlsx

Standardized u Chart