Offline Eval Set 40 Question Explained
This worked AI Engineer Interview practice question tests Validation and Learning. Try the answer first, then review why A is the best choice.
Short answer
The correct answer is A. Whether the eval set covers the traffic that is now failing — 40 examples is far too small to generalize..
When two signals disagree, audit what each one actually measures — a 40-example eval almost certainly under-covers the failing traffic, and its coverage is checkable today. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, A. Whether the eval set covers the traffic that is now failing — 40 examples is far too small to generalize. is the only option that satisfies the scenario without adding unrelated behavior.
The Question
Your offline eval set of 40 examples says the new model is better. Support tickets say otherwise. What do you check first?
Why A is correct
When two signals disagree, audit what each one actually measures — a 40-example eval almost certainly under-covers the failing traffic, and its coverage is checkable today. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, A. Whether the eval set covers the traffic that is now failing — 40 examples is far too small to generalize. is the only option that satisfies the scenario without adding unrelated behavior.
Why the other options are wrong
Option B does not match the requirement in the prompt. The correct answer is A because When two signals disagree, audit what each one actually measures — a 40-example eval almost certainly under-covers the failing traffic, and its coverage is checkable today.
Option C does not match the requirement in the prompt. The correct answer is A because When two signals disagree, audit what each one actually measures — a 40-example eval almost certainly under-covers the failing traffic, and its coverage is checkable today.
Option D does not match the requirement in the prompt. The correct answer is A because When two signals disagree, audit what each one actually measures — a 40-example eval almost certainly under-covers the failing traffic, and its coverage is checkable today.
Key idea: Validation and Learning
Every question is a production situation an AI engineer interviewer can put to you: a failing endpoint, a cost spike, an agent that loops, an eval that disagrees with users. The best answer is almost always the one that measures or contains the problem before it changes the model or the prompt. If you miss a question, note which habit it tests: decompose before you fix, put the security boundary where the side effect happens, and trust an eval only after you check what it covers. The 12 open-ended questions with answer guides are at aijobprep.app/questions/ai-engineer.html.
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