A rule of thumb for p-charts is to use a sample size of at least 250.

Name: A rule of thumb for p-charts is to use a sample size of at least 250.
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Quizplus · Accepted Answer

There is no set rule for the minimum sample size for p-charts, as it depends on the level of precision desired and the stability of the process being measured. Generally, a sample size of at least 30 is recommended to ensure randomness and validity of the data.

A Rule of Thumb for P-Charts Is to Use a Sample