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Updated weekly · Last refresh Aug 30

EY-Parthenon Data Scientist Interview Questions

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

50questions
~7htotal time
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1
Machine LearningStart here. 9 questions · ~73 min
2
A/B Testing & Experimentation5 questions · ~40 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 MismatchEY-Parthenon
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3
Metrics3 questions · ~24 min
Using Dashboards to Read KPIsEasy

Explain how visualization tools help analysts track KPIs, spot patterns, and support decisions.

KPIsData WranglingDiagnosisEY-Parthenon
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4
SQL & Data Manipulation8 questions + 3 drills · ~95 min
5
Statistics & Probability4 questions · ~32 min
Interpreting P Values in TestingEasy

Explain what a p-value means in hypothesis testing and how it relates to statistical significance.

Hypothesis TestingStatistical SignificanceP-ValuesEY-Parthenon
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6
Product Sense5 questions · ~40 min
Define Launch Success MetricsMedium

Approach for choosing launch success metrics, including a north star, leading indicators, and clear success criteria.

Product-Market FitUser NeedsKPIEY-Parthenon
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7
More topics16 questions · ~129 min
Evaluate Classification Model PerformanceEasy

Explain a practical framework for evaluating an AI model using core classification metrics and error analysis.

Confusion MatrixPrecisionAUC-ROCEY-Parthenon
Ensuring ReproducibilityMedium

Tests practices for repeatable results, versioning, and reliable analysis pipelines.

best practicesreproducibilityData AnalysisEY-Parthenon
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.