What size change can 50,000 labels a day actually detect?
Power & sample sizeMediumProblem. Leadership sets an OKR: detect any week-over-week move in prevalence of 5% or more, and alert on it. You have 50,000 labels a day for this policy. Can you deliver?
Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.