Your question is Scaling Analysis with Data Quality Controls. 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 do you deal with a large dataset?
Asked in the phone interview stage. The interviewer is probing how you break down scale, choose appropriate tools, protect data quality, and make trade-offs between speed and accuracy. Explain a specific experience using the STAR structure, including how you clarified the analytical objective, assessed the dataset, and communicated limitations.
A strong answer should distinguish exploratory work from production analysis, describe validation and performance techniques, and quantify the result where possible. Address what you learned and what you would change in retrospect.