Pick the unit of randomization for a delivery experiment
Experiment designHardProblem. You're testing a Core-Delivery change. How do you choose the unit of randomization, and when is order-level A/B valid vs invalid?
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.