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European Central Bank Data Scientist Interview Questions

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

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~2htotal time
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1
Statistics & ProbabilityStart here. 3 questions · ~25 min
Explaining P Values ClearlyEasy

Explain what a p-value means, how it relates to statistical significance, and how to describe it clearly to non-technical stakeholders.

CommunicationStatistical SignificanceP-ValuesEEuropean Central Bank
Addressing Selection BiasMedium

Evaluates strategies to mitigate bias in data analysis.

statisticsdata integrityEEuropean Central Bank
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2
A/B Testing & Experimentation4 questions · ~33 min
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchEEuropean Central Bank
Diagnosing Post-Deployment Metric DropsMedium

Evaluates debugging and root-cause analysis post-deployment.

DiagnosisEEuropean Central Bank
Measuring Impact of an Internal ToolMedium

Tests metric design thinking for internal tooling impact.

EEuropean Central Bank
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3
Behavioral & Leadership6 questions · ~50 min
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4
More topics3 questions · ~25 min
Handling Missing and Skewed DataMedium

Explain how to handle NULLs, skewed values, and outliers when preparing an analysis dataset using SQL.

Data Qualitynull handlingData WranglingEEuropean Central Bank
Using Python DictsEasy

Tests Python knowledge and data structure familiarity.

Data Structurespythontechnical knowledgeEEuropean Central Bank
Explain Your Spark ExperienceMedium

Tests familiarity with big data processing frameworks and practical usage.

data processingEEuropean Central Bank

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Data Quality ChecksHard
Practice
Practice drill

Detect missing fields, duplicate transaction keys, invalid amounts, and merchant reference issues with PostgreSQL CTEs and joins.

Data Qualitynull handlingdata integritySigmoidCox Automotive
Handling Missing Data in DashboardsMedium
Practice
Practice drill

Classify missing or corrupted dashboard metrics and expose only validated values for executive reporting.

missing valuesData Qualitydata accuracySoFi
Dictionary Key TypesMedium
Practice
Practice drill

Identify repeated two-column key combinations, including combinations containing NULL values.

null handlingData ManipulationData StructuresPoint72
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