Link redesign wins overall, loses at one big customer, and the split is off. Decide.
Decide from resultsHardProblem. A Link redesign test reads +1.2% relative conversion overall (p = 0.03). At one large customer, conversion is down about 3%, and that customer's treatment arm has noticeably fewer users than its control arm. The PM wants to ship everywhere and "look into" that customer later. What's your call?
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.