Coach note

Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.

Experiment design · Interpreting unexpected results

Halfway through a test you notice the treatment arm has 4% fewer users than the 50/50 split should produce. Your PM says that's close enough — keep going. What's your call?

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Halfway through a test you notice the treatment arm has 4% fewer users than the 50/50 split should produce. Your PM says that's close enough — keep going. What's your call?

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