Your question is Validate Design Decisions with Experiments. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How did you validate your design decisions?
Answer this as a practical experimentation question. Explain how you would validate the hypothesis, primary metric, guardrails, MDE, sample-size assumptions, unit of randomization, and analysis plan. Discuss how you would detect invalid results, including peeking, sample ratio mismatch, novelty effects, or a mismatch between randomization and analysis units.