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Updated weekly · Last refresh Oct 17

Cotiviti Data Scientist Interview Questions

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

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1
Machine LearningStart here. 5 questions · ~42 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 EngineeringRegularizationCotiviti
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2
Statistics & Probability4 questions · ~34 min
Investigating Data AnomaliesMedium

Evaluates your diagnostic thinking for detecting and explaining unexpected data behavior.

RegressionCorrelationConditional ProbabilityCotiviti
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3
Behavioral & Leadership9 questions · ~76 min
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4
More topics9 questions · ~76 min
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice

Calculate the monthly spending trends for customers using window functions and joins.

Cotiviti
Choosing Model Evaluation TechniquesEasy

Explain how you evaluate models using the right metrics, validation strategy, and error analysis for the problem.

PrecisionAccuracyRecallCotiviti
Define Metrics for a Customer TestHard

Define the primary metric, guardrails, and power for a customer-facing A/B test before deciding whether to ship.

ExperimentationGuardrail MetricsA/B TestingCotiviti
Using Data to Influence DecisionsEasy

Share how you used data to shape a business decision, including the analysis, recommendation, and outcome.

User ResearchUser NeedsValue PropositionCotiviti
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 IndicatorsDiagnosisCotiviti
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 MismatchCotiviti
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
The finish line: interview-readyComplete all 27 questions plus 2 hands-on drills to finish this plan.