Your question is A/B Testing With Coding and Stats. 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).
Tell me about how you would handle an A/B testing problem, including the statistical reasoning and any coding you would write.
Explain how you would define the experimental unit, formulate hypotheses, select primary metrics, estimate sample size, and analyze binary or continuous outcomes. Discuss randomization checks, confidence intervals, multiple testing, sequential monitoring, and practical significance. Provide Python that validates the experiment and reports an actionable conclusion.