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The test set should contain enough examples to make the estimate of overall system performance reliable.

Test Set Size Should Enable Reliable Evaluation

What is the key requirement for choosing a test set size?

A sufficiently large test set makes the final performance estimate more reliable.

A test set should support a high-confidence estimate of the model's _____ performance.

Match each test-set concept to the meaning it carries in this context.

Order the reasoning used to decide whether a test sample is large enough to support a dependable estimate.

Question:
In a short analytical response, explain how the size of a test set should be chosen when the goal is a trustworthy estimate of end-to-end system performance.

Sample answer:
The right test-set size is the one that gives enough statistical confidence in the estimate of overall system performance. In other words, the set is not large for its own sake; it is large enough to make the final performance estimate reliable.

Key points:
- Test-set size is determined by the needed confidence level.
- The estimate should concern overall system performance.
- A larger set is useful only when it improves reliability.
- Size is a means to confidence, not the objective by itself.

Rubric:
A strong response should link test-set size to the desired confidence in the overall performance estimate and avoid treating size as an independent goal.

Choosing test-set size for a reliable estimate

Case context:
A robotics team builds a test set for a navigation system. They say that once the test set exists, its size is automatically acceptable, even though they cannot trust the reported overall accuracy very much.

Question:
Identify the flaw in their reasoning and state the condition that must hold before the test set can be considered large enough.

Sample answer:
The team is missing the key requirement. A test set is not adequate merely because it was created; it must be large enough that its estimate of overall system performance is reliable with high confidence.

Key points:
- Having any test set is not enough.
- The size must support a reliable estimate.
- The estimate should concern overall system performance.
- High confidence is the deciding criterion.

Rubric:
The response should mention the missing high-confidence requirement and tie it to a reliable estimate of overall system performance and adequate test-set size.

Decide whether a team has used the right standard for test-set size.

Question:
Answer in one to three sentences using only the underlying principle.

Sample answer:
A larger test set makes the evaluation less noisy, so the measured score is a more trustworthy estimate of how the model will do on future data.

Key points:
- Less evaluation noise
- More trustworthy estimate
- Future data performance

Rubric:
Full credit requires mention of both reduced uncertainty in evaluation and a reliable estimate of future performance; answers that only say the set should be big are incomplete.

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