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Two search rankers look equally good offline. Would you use interleaving or an A/B test to choose one?

Try it in the practice workspaceDraft your answer before comparing it with the rubric.

Compare ranking preferences efficiently without mistaking a click preference for a retention or revenue result.

Updated Oct 2026 · Original practice questions with worked answers and teaching rubrics. Our editorial policy explains the sources, review process and limits.

Case briefRead the inputs, then make your call

An internal document-search product has two rankers with similar offline scores. Both return permission-checked document links. The pilot figures are illustrative.

Scenario inputs
Pilot200 sessions: 80 prefer B, 60 prefer A and 60 tie under a prespecified credit rule.
Assumption to examineThe arithmetic exercise treats sessions as independent. Establish whether repeated users or queries violate this in practice.
Product decisionLeadership wants to know whether to replace the ranker and whether search improves task completion.

Your task. Choose an experiment sequence, interpret the pilot and explain what the result can and cannot establish.

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