Essay

Explain why test-set size should be judged by confidence in overall performance.

Question: In a concise analytical response, explain the relationship among test-set size, high confidence, and the system's overall performance.

Sample answer: Test-set size should be evaluated according to whether the set is large enough to give high confidence in the system's overall performance. Thus, size is not treated as an isolated goal; it serves the purpose of supporting a confident overall performance estimate.

Key points:

  • The test set must be large enough.
  • The desired result is high confidence.
  • The confidence concerns overall system performance.
  • Test-set size serves the performance-estimation goal.

Rubric: A strong response accurately connects test-set size to high confidence and applies that confidence to overall system performance without introducing unsupported criteria.

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Updated 2026-07-19

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