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Harvard Medical School Data Scientist Interview Questions

The questions to prepare for a Harvard Medical School Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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1
A/B Testing & ExperimentationStart here. 5 questions · ~41 min
Significance of A/B TestingEasy

Explain why A/B testing matters in marketing analytics and how it supports causal, metric-driven campaign decisions.

ExperimentationGuardrail MetricsA/B TestingHarvard Medical School
Plan Sample Size for In-App ExperimentMedium

Estimate sample size and power for an experiment, define MDE and guardrails, and decide whether the test is worth running.

MDEPower AnalysisSample SizeHarvard Medical School
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2
Machine Learning4 questions · ~33 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 TradeoffHarvard Medical School
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3
Statistics & Probability3 questions · ~24 min
Interpreting P Values in TestingEasy

Explain what a p-value means in hypothesis testing and how it relates to statistical significance.

Hypothesis TestingStatistical SignificanceP-ValuesHarvard Medical School
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4
Behavioral & Leadership8 questions · ~65 min
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5
More topics6 questions · ~49 min
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 IndicatorsDiagnosisHarvard Medical School
SQL Running Totals and LagMedium

Tests your SQL window function capability for time-series feature engineering.

Window FunctionsLag/LeadRunning TotalsHarvard Medical School
Prioritizing Features for Healthcare AnalyticsMedium

Tests product sense and your ability to translate user needs into measurable value.

Feature PrioritizationUser NeedsProduct VisionHarvard Medical School
Improving an Existing Data PipelineMedium

Assesses your ability to diagnose bottlenecks and improve reliability and performance in production data pipelines.

optimizationHarvard Medical School
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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 26 questions plus 3 hands-on drills to finish this plan.