Assistant Passes 500 Case Question Explained
This worked AI Engineer Interview practice question tests Problem Framing. Try the answer first, then review why D is the best choice.
Short answer
The correct answer is D. Stratify the eval by context length and evidence position, and build paired cases that move the evidence while holding the answer constant..
The failures cluster on a known axis, so the eval must measure that axis directly — random volume dilutes it further. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, D. Stratify the eval by context length and evidence position, and build paired cases that move the evidence while holding the answer constant. is the only option that satisfies the scenario without adding unrelated behavior.
The Question
Your assistant passes a 500-case benchmark, but production failures cluster in long conversations where the decisive policy sentence sits mid-context. The team wants to add 500 more random cases. What do you do first?
Why D is correct
The failures cluster on a known axis, so the eval must measure that axis directly — random volume dilutes it further. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, D. Stratify the eval by context length and evidence position, and build paired cases that move the evidence while holding the answer constant. is the only option that satisfies the scenario without adding unrelated behavior.
Why the other options are wrong
Option A does not match the requirement in the prompt. The correct answer is D because The failures cluster on a known axis, so the eval must measure that axis directly — random volume dilutes it further.
Option B does not match the requirement in the prompt. The correct answer is D because The failures cluster on a known axis, so the eval must measure that axis directly — random volume dilutes it further.
Option C does not match the requirement in the prompt. The correct answer is D because The failures cluster on a known axis, so the eval must measure that axis directly — random volume dilutes it further.
Key idea: Problem Framing
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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