Known Data Scientist Interview Questions

The questions to prepare for a Known Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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Median CTR by Meta Campaign

Hard

Use window functions to compute median CTR per Meta ad campaign, excluding rows with zero or null impressions.

Known

Rolling 7-Day CTR With Windows

Hard

Tests advanced SQL window functions and correct time-based metric computation.

Window FunctionsLag/LeadRunning Totals

Known

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A/B Test for Ad Ranking Change

Hard

Tests rigorous experimentation design, metric selection, and risk controls for ad ranking changes.

Guardrail MetricsNovelty EffectSample Ratio Mismatch

Known

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Testing a Conversion Rate Drop

Medium

Explain how to test whether an observed 5% conversion rate drop is statistically significant in an experiment or before-after comparison.

Hypothesis TestingData AnalysisStatistical Significance

Known

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Define Metrics for New Features

Medium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser value

Known

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Diagnose a 15% KPI Drop

Medium

Tests KPI debugging, root-cause analysis, and distinguishing instrumentation from product changes.

KPILeading IndicatorsDiagnosis

Known

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