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The Johns Hopkins University Applied Physics Laboratory Data Scientist Interview Questions

The questions to prepare for a The Johns Hopkins University Applied Physics Laboratory Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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1
Statistics & ProbabilityStart here. 4 questions · ~34 min
Missing Data Without BiasMedium

Tests missing-data strategy selection and bias-aware preprocessing in clinical data.

SamplingBiasdata integrityThe Johns Hopkins University Applied Physics Laboratory
Handling Confounding in Observational StudiesHard

Tests causal reasoning and methods to reduce bias from confounding.

SamplingBiasCausal InferenceThe Johns Hopkins University Applied Physics Laboratory
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2
Behavioral & Leadership9 questions · ~77 min
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3
More topics7 questions · ~60 min
Rolling 7-Day Average with Window FunctionsMedium
Practice

Calculate patient rolling 7-day averages and rank patients within each Medpace research site using layered window functions.

Window FunctionsRankingRunning TotalsThe Johns Hopkins University Applied Physics Laboratory
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchThe Johns Hopkins University Applied Physics Laboratory
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 IndicatorsDiagnosisThe Johns Hopkins University Applied Physics Laboratory
Epidemiological Model EvaluationMedium

Tests ability to assess discrimination and calibration for epidemiological predictions.

Evaluation TechniquesCalibrationModel MetricsThe Johns Hopkins University Applied Physics Laboratory
North Star Metrics for Research ToolsMedium

Tests product thinking and metric design tied to research workflow outcomes.

North Star MetricKPIsMetricsThe Johns Hopkins University Applied Physics Laboratory
Survival vs Standard RegressionMedium

Tests understanding of time-to-event modeling and correct model selection.

Feature Engineeringmodel trainingSupervised LearningThe Johns Hopkins University Applied Physics Laboratory
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