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Why a 2,000-Item Manual Review Set Fits a 5% Error Rate
Question: In one or two sentences, explain why a manual review development set should be about 2,000 examples large when a classifier’s error rate is 5%.
Sample answer: With a 5% error rate, a set of 2,000 examples will contain about 100 mistakes, since 0.05 × 2,000 = 100. That gives enough failed cases to inspect patterns instead of trying to draw conclusions from only a handful of errors.
Key points:
- 0.05 × 2,000 = 100
- The purpose is to collect roughly 100 errors for analysis
Rubric: The response should state the calculation for 5% of 2,000 or explain that the set is sized to yield about 100 errors for inspection.
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