Known Data Scientist Interview Questions
The questions to prepare for a Known Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Use window functions to compute median CTR per Meta ad campaign, excluding rows with zero or null impressions.
KnownAssesses practical competence in SQL and Python plus structured reasoning.
KnownCalculate patient 7-day rolling lab averages and compare each result with the rolling average from seven days earlier.
Boston Children's HospitalDesign an incrementality experiment for a co-branded card campaign, including lift metric, power, guardrails, and launch criteria.
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Explain how to test whether an observed 5% conversion rate drop is statistically significant in an experiment or before-after comparison.
KnownTests probability modeling and reasoning under constraints.
KnownExplain how L1 and L2 regularization differ geometrically and probabilistically, grounded in a practical supervised learning example.
KnownDefine a success metric for a new feature that captures real user value, not just raw usage.
KnownTests KPI debugging, root-cause analysis, and distinguishing instrumentation from product changes.
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