Prevalence fell after a policy change. Real, or a new definition?
Causal inferenceHardProblem. The policy team revised a policy definition to make it clearer for enforcement. In the weeks after, measured prevalence fell about 30%. Leadership wants to report a safety improvement. Work through it.
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.