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Updated weekly · Last refresh Aug 30

Sandia National Laboratories Data Scientist Interview Questions

The questions to prepare for a Sandia National Laboratories Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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1
Machine LearningStart here. 6 questions · ~48 min
Prevent Overfitting in ML ModelsEasy

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

Cross-ValidationBias-Variance TradeoffRegularizationSandia National Laboratories
Supervised vs Unsupervised LearningEasy

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

Unsupervised LearningFeature EngineeringBias-Variance TradeoffSandia National Laboratories
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2
SQL & Data Manipulation3 questions + 3 drills · ~54 min
3
Behavioral & Leadership7 questions · ~56 min
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4
More topics6 questions · ~48 min
Primary vs Guardrail Metric ChoiceMedium

Choose a primary success metric and guardrails for a game experiment, then explain how that choice drives power, analysis, and ship decisions.

ExperimentationGuardrail MetricsA/B TestingSandia National Laboratories
Choosing Classification Evaluation MetricsEasy

Explain which classification metrics to use and how metric choice depends on the business objective and error tradeoffs.

PrecisionAccuracyRecallSandia National Laboratories
Diagnose KPI Drop After ReleaseMedium

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosisSandia National Laboratories
Statistical Significance of ChangesMedium

Tests statistical testing choices, assumptions, and interpreting significance for decision-making.

Hypothesis TestingStatistical SignificanceP-ValuesSandia National Laboratories
Designing Product Value MetricsMedium

Tests product sense for defining measurable outcomes and connecting metrics to user value and impact.

North Star MetricUser NeedsValue PropositionSandia National Laboratories
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