Only 18 pilot businesses: how do you design the test?
Experiment designHardProblem. The team built a prototype that makes checkout faster for returning buyers. Eighteen pilot businesses have it integrated, each with a few hundred checkout sessions a week. The PM wants an A/B test to decide whether it raises conversion. How would you design 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.