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u chart is one of the quality control charts to monitor the number of defects per unit, while the c chart is for a constant sample size. Use a u chart to monitor process stability over time and monitor the effects of before and after process improvements.
The main difference between U and C charts is the vertical scale. U charts show the number of defects per unit on the y-axis. C charts show the number of defects per sample, where each item can have multiple defects. The chart that you choose does not affect which points are out of control. Note.
The U chart plots the number of defects (also called nonconformities) per unit. It is possible for an item to have one or more defects but still be acceptable in function and performance. The center line represents the mean number of defects per unit (or subgroup).
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Use U Chart to monitor the number of defects per unit, where each item can have multiple defects. Use this control chart to monitor process stability over time so that you can identify and correct instabilities in a process.
Choose Stat > Control Charts > Attributes Charts > U. In Variables, enter Errors. In Subgroup sizes, enter Number of Pages. Click U Chart Options. On the Tests tab, select 1 point > K standard deviations from center line (Test 1) and K points in a row on same side of center line (Test 2).
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