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Prep plan
Updated weekly · Last refresh Aug 30

CDC Foundation Data Scientist Interview Questions

The questions to prepare for a CDC Foundation Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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1
PipelinesStart here. 9 questions · ~74 min
Handling Missing Data in PipelinesMedium

Approach for handling missing data in an ML data pipeline, including validation, imputation, and safe downstream consumption.

InfrastructureETLBatch ProcessingCDC Foundation
Optimize a Large Data WorkflowMedium

Approach for improving pipeline efficiency while keeping the same business logic and outputs.

InfrastructureETLQualityCDC Foundation
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityCDC Foundation
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2
Statistics & Probability3 questions · ~25 min
Choosing Statistical Methods for AnalysisMedium

Explain how you choose among common statistical methods based on the question, data structure, and risk of bias.

Confidence IntervalsRegressionCorrelationCDC Foundation
Investigating Disease Incidence SpikesHard

Tests statistical reasoning for anomaly detection, causal thinking, and appropriate public health interpretation.

CorrelationCausal InferenceTime SeriesCDC Foundation
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3
Behavioral & Leadership3 questions · ~25 min
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4
More topics3 questions · ~25 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 TradeoffCDC Foundation
Analysis That Drove Measurable ImpactEasy

Describe a case where your analysis used the right metrics, shaped a decision, and produced a meaningful business result.

KPIsLeading IndicatorsDiagnosisCDC Foundation
Implementing Machine Learning for OutcomesMedium

Tests applied ML experience, problem framing, and measurable impact on public health analytics.

Cross-ValidationFeature EngineeringSupervised LearningCDC Foundation
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