Design a thumbnail test when the audience changes over a video's life
Experiment designMediumProblem. For an upcoming main-channel video, the team will test three thumbnails using YouTube's built-in test, which splits impressions across thumbnails and reports the winner by watch time share. A creative lead wants to call the winner after the first six hours "while it matters most". How would you design and read this test?
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.