Welcome to your interview.
The question is on your right: Diagnosing a Product Metric Drop. 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 notice a key product metric has dropped below its recent baseline. Before escalating, you need to decide whether this is a real change or ordinary noise in the metric.
How would you determine whether a product metric drop is statistically significant or due to normal variation?