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Updated weekly · Last refresh Aug 30

4P Consulting Data Scientist Interview Questions

The questions to prepare for a 4P Consulting Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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Behavioral & LeadershipStart here. 7 questions · ~56 min
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More topics9 questions · ~72 min
Define Success Metrics for FeaturesMedium

Set a clear north star, supporting KPIs, leading indicators, and guardrails for a new product feature.

North Star MetricLagging IndicatorsKPIs4P Consulting
Handling Missing and Dirty SQL DataMedium

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQuality4P Consulting
Define Metrics for New FeaturesMedium

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

MetricsFeature Prioritizationuser value4P Consulting
Design and Reflect on A/B TestMedium

Describe an A/B test you ran, what question it answered, how you measured success, and what you learned from the results.

ExperimentationGuardrail MetricsA/B Testing4P Consulting
Preventing Overfitting on Small DataMedium

Explain how to reduce overfitting on small or noisy datasets using regularization, validation strategy, and model complexity control.

Cross-ValidationBias-Variance TradeoffRegularization4P Consulting
First Checks for Metric DropsEasy

Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.

Lagging IndicatorsLeading IndicatorsDiagnosis4P Consulting
RANK vs DENSE_RANK in LeaderboardsEasy

Explain how RANK() and DENSE_RANK() handle ties differently in ordered SQL results such as leaderboards.

Window FunctionsRankingData Wrangling4P Consulting
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 Mismatch4P Consulting
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 16 questions plus 3 hands-on drills to finish this plan.