Top 15

Prep plan

Updated weekly · Last refresh Nov 3

Owner Data Scientist Interview Questions

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

15questions

~2htotal time

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A/B Testing & ExperimentationStart here. 3 questions · ~30 min

Ensuring A/B Test ValidityHard

Explain how to design, power, monitor, and analyze an A/B test so its conclusions are statistically and practically valid.

experiment designMDEGuardrail Metrics

Owner

Pricing Page Experiment DesignHard

Design an end-to-end A/B test for a pricing page, including MDE, guardrails, analysis plan, and a ship decision.

Guardrail MetricsSample SizeA/B Testing

Owner

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Product Sense3 questions · ~30 min

Improve Subscription Customer RetentionMedium

Framework for diagnosing churn and prioritizing product changes to improve retention in a subscription service.

User NeedsUse CasesProduct Vision

Owner

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Behavioral & Leadership4 questions · ~39 min

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More topics5 questions · ~49 min

SQL: First and Last Event Per UserMedium

Practice

Use ranked window functions and conditional aggregation to identify each NewWave user’s first and last recorded event.

Window FunctionsDate FunctionsRanking

Owner

Statistical Significance MethodsHard

Explain how to design, test, and validate analyses so statistical significance is reliable rather than a result of sampling noise or repeated testing.

Hypothesis TestingData AnalysisStatistical Significance

Owner

Investigate Sudden Metric DropHard

Build a systematic process to validate a 10% overnight KPI decline, isolate its cause, and recommend corrective action.

root cause analysisKPIoperational health

Owner

SQL Window Functions for Rolling MetricsHard

Practice

Calculate each user's 7-day activity average and rank users within their cohort using PostgreSQL window functions.

Window FunctionsDate FunctionsData Manipulation

Owner

Diagnose Engagement DropHard

Identify the causes of a quarterly engagement decline through metric validation, decomposition, segmentation, and trend analysis.

MetricsDiagnosisuser engagement

Owner

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Hands-on SQL practiceWrite and run real queries in the editor. 1 drill · ~10 min

Check Ingredient SufficiencyHard

Practice

Practice drill

Use cumulative ingredient demand to identify which pizza orders exceed available topping inventory.

Date Functionssql queriesdata validation

Owner

The finish line: interview-readyComplete all 15 questions plus 1 hands-on drill to finish this plan.