Welcome to your interview.
The question is on your right: Sample Size for 95% Confidence A/B Test. 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.
A product team wants to run an A/B test on a new Charles Schwab portfolio dashboard. How would you determine the sample size required to achieve a 95% confidence level?