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Prep plan
Updated weekly · Last refresh Oct 17

Pathloom Data Scientist Interview Questions

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

23questions
~4htotal time
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1
SQL & Data ManipulationStart here. 4 questions + 1 drill · ~48 min
2
Machine Learning4 questions · ~38 min
Improving Model Quality with TuningMedium

Explain how to tune hyperparameters to improve validation performance while controlling overfitting and underfitting.

Hyperparameter TuningRegularizationGradient DescentPathloom
Experience with ML TechniquesEasy

Describe your hands-on experience applying supervised learning, feature engineering, and model evaluation in real projects.

Cross-ValidationFeature EngineeringSupervised LearningPathloom
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3
Statistics & Probability3 questions · ~28 min
Evaluating Observed Lift SignificanceMedium

Explain how to test whether an observed experiment lift is real using hypothesis testing, p-values, and confidence intervals.

Confidence IntervalsStatistical SignificanceP-ValuesPathloom
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4
Behavioral & Leadership7 questions · ~66 min
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5
More topics5 questions · ~47 min
Discovery UI Metrics and GuardrailsMedium

Define primary and guardrail metrics for a discovery UI test, with power, MDE, and a pre-registered analysis plan.

ExperimentationGuardrail MetricsA/B TestingPathloom
Analyze New Feature EngagementMedium

Assess a new feature using adoption, activation, repeat usage, and retention metrics tied to user value.

Leading IndicatorsA/B TestingEngagement MetricsPathloom
Finding Purchase Trends to Lift SalesMedium

Tests your ability to derive actionable business insights from customer purchase behavior.

User NeedsUse CasesProduct VisionPathloom
Design Test for Novelty and SpilloversHard

Design an experiment that accounts for novelty effects and network spillovers before deciding whether to ship.

Network InterferenceExperimentationNovelty EffectPathloom
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The finish line: interview-readyComplete all 23 questions plus 1 hands-on drill to finish this plan.