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Updated weekly · Last refresh Aug 30

Lawrence Berkeley Lab Data Scientist Interview Questions

The questions to prepare for a Lawrence Berkeley Lab Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

12questions
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1
Machine LearningStart here. 7 questions · ~56 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffLawrence Berkeley Lab
Describe an ML Project You BuiltMedium

Describe a machine learning project, from problem framing and feature work to model training and evaluation.

Cross-ValidationFeature EngineeringSupervised LearningLawrence Berkeley Lab
Prevent Overfitting in ML ModelsEasy

Explain how to reduce overfitting using regularization, validation, and model selection.

Cross-ValidationBias-Variance TradeoffRegularizationLawrence Berkeley Lab
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2
More topics5 questions · ~40 min
Handling Missing DataHard

Tests data quality handling and correct treatment of missingness.

Window FunctionsData WranglingCTEsLawrence Berkeley Lab
Improve Underperforming Model AccuracyMedium

Approach for diagnosing an underperforming model and improving accuracy through error analysis, feature work, tuning, and bias variance tradeoffs.

Cross-ValidationAccuracyThreshold TuningLawrence Berkeley Lab
Big Data Technologies ExperienceMedium

Tests your hands-on experience building scalable data pipelines and workflows.

InfrastructureToolsData ModelingLawrence Berkeley Lab
Effective Methods for Large DataEasy

Tests your practical statistical toolkit for scaling analysis to large datasets.

Central Limit TheoremRegressionCorrelationLawrence Berkeley Lab
Evaluating Predictive Model EffectivenessMedium

Tests model evaluation methodology and selection of appropriate metrics and validation strategies.

PrecisionAccuracyRecallLawrence Berkeley Lab

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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