Qualitymag iconQualitymagSep 22, 2026

When Sampling Beats Counting: How You Know a Statistical QA Plan Actually Works

A 3,000-month simulation study shows why the Wilson score interval provides more reliable uncertainty estimates than the textbook Wald method at the low error rates common in calibration QA.

When Sampling Beats Counting: How You Know a Statistical QA Plan Actually Works

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A 3,000-month simulation study shows why the Wilson score interval provides more reliable uncertainty estimates than the textbook Wald method at the low error rates common in calibration QA.

Not every 95% confidence interval actually delivers 95% coverage.

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A 3,000-month simulation study shows why the Wilson score interval provides more reliable uncertainty estimates than the textbook Wald method at the low error rates common in calibration QA. Not every 95% confidence interval actually delivers 95% coverage.

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Not every 95% confidence interval actually delivers 95% coverage.

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