Welcome to your interview.
The question is on your right: Plan Sample Size for In-App Experiment. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
You work on a consumer marketplace app and are planning an A/B test on a new in-app experience. Leadership wants to know whether the experiment is large enough to detect a meaningful change before you launch it.
How do you think about sample size and power when planning this experiment? Walk through how you would define the minimum detectable effect, choose the primary metric and guardrails, and decide whether the test is feasible.