Short Answer

Why must a test set be big enough?

Question: Answer in one to three sentences using the stated purpose of test-set sizing.

Sample answer: A test set must be big enough so that it gives a confident estimate of the system's final performance.

Key points:

  • Confident estimate
  • Final performance of the system

Rubric: Full credit requires both confidence in the estimate and final system performance to be mentioned.

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Updated 2026-07-19

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