Top 22

Prep plan

Updated weekly · Last refresh Sep 21

CNN Data Scientist Interview Questions

The questions to prepare for a CNN Data Scientist interview. Questions from real interview reports rank first. Updated daily.

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Machine LearningStart here. 6 questions · ~55 min

Handling Missing Values in MLEasy

Explain practical strategies for handling missing values in a supervised learning workflow, from diagnosis to modeling and validation.

Cross-ValidationFeature EngineeringRegularization

CNN

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Behavioral & Leadership6 questions · ~55 min

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More topics10 questions · ~91 min

7-Day Rolling Average ExportsMedium

Practice

Calculate a 7-day rolling average of Adobe Acrobat document exports using a window function.

Data AnalysisAggregations

CNN

Investigate User Engagement DeclineMedium

Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.

RetentionDiagnosisEngagement Metrics

CNN

Statistical Significance for CTRMedium

Tests statistical testing choices and interpretation for metrics like CTR.

Hypothesis TestingStatistical SignificanceP-Values

CNN

Designing CNN A/B ExperimentHard

Tests experimental design rigor, instrumentation, and validity for CNN product changes.

MDEGuardrail MetricsA/B Testing

CNN

Improve CNN Content RecommendationsHard

Tests system thinking for recommendation accuracy, including data, modeling, evaluation, and iteration.

ML RankingFeature StoreRecommendation Systems

CNN

Sorting Algorithm ComplexityEasy

Tests understanding of algorithmic complexity tradeoffs for common sorting methods.

CommunicationOwnershipDealing With Ambiguity

CNN

Evaluate Model PerformanceEasy

Tests your understanding of metrics, validation strategy, and tradeoffs for model quality.

PrecisionAccuracyRecall

CNN

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Hands-on SQL practiceWrite and run real queries in the editor. 1 drill · ~10 min

SQL Query for Data ExtractionEasy

Practice

Practice drill

Extract qualifying market observations by venue and price, then return them in chronological order.

JoinsData ManipulationGroup By

Equifax

DPR Construction

RigUp

The finish line: interview-readyComplete all 22 questions plus 1 hands-on drill to finish this plan.