Welcome to your interview.
The question is on your right: Significance of A/B Testing. 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 marketing analytics team that is deciding between two versions of a campaign experience, such as different email creative, landing page copy, or call-to-action treatments. Stakeholders want to know why running an A/B test is better than relying on before-and-after comparisons or intuition alone.
Can you explain the significance of A/B testing in marketing analytics, including what it helps you learn, how you would define success, and why it leads to better decisions than observational comparisons?