Top 33
Prep plan
Updated weekly · Last refresh Oct 17

MediaMath Data Scientist Interview Questions

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

33questions
~5htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 1 drill · ~54 min
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice

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

MediaMath
Structure Retention Cohort AnalysisMedium

Explain how to structure a cohort retention query using cohort assignment, period offsets, and aggregation in PostgreSQL.

Date FunctionsCTEsGroup ByMediaMath
Top 10 Customers by SpendEasy
Practice
Practice drill

Find EarthCam's top 10 customers by total spend using GROUP BY, SUM, ORDER BY, and LIMIT.

RankingGroup ByAggregationsEarthcamAmazon AdvertisingFetch
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2
Model Evaluation3 questions · ~26 min
Improve Model AccuracyMedium

Approach for improving a model's accuracy by checking errors, features, and tuning choices.

Hyperparameter TuningCross-ValidationAccuracyMediaMath
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3
A/B Testing & Experimentation3 questions · ~26 min
Marketing Campaign A/B Test DesignMedium

Design a marketing campaign experiment with a pre-registered metric plan, power calculation, and ship rule that respects guardrails.

ExperimentationHypothesis TestingA/B TestingMediaMath
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4
Metrics3 questions · ~26 min
Classify Leading vs Lagging MetricsEasy

Explain how to distinguish early directional metrics from outcome metrics, using a clear KPI framework tied to product decisions.

Lagging IndicatorsKPIsLeading IndicatorsMediaMath
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5
Machine Learning5 questions · ~44 min
Bias-Variance Tradeoff in PracticeMedium

Explain the bias-variance tradeoff and how it guides model choice, regularization, and generalization performance.

Cross-ValidationBias-Variance TradeoffRegularizationMediaMath
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6
Statistics & Probability4 questions · ~35 min
ROC Curve and DistributionsMedium

Evaluates your understanding of core statistics and how you interpret ROC curves for model performance.

probabilitystatisticsMediaMath
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7
More topics10 questions · ~87 min
Choosing a North Star MetricMedium

Tests your ability to connect metrics to user value, business goals, and measurement validity.

North Star MetricValue PropositionProduct VisionMediaMath
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The finish line: interview-readyComplete all 33 questions plus 1 hands-on drill to finish this plan.