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Updated weekly · Last refresh Aug 30

Crayon Data Data Scientist Interview Questions

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

21questions
~3htotal time
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1
Machine LearningStart here. 5 questions · ~44 min
Handling Imbalanced Fraud LabelsMedium

Explain how to train and evaluate models on highly imbalanced fraud data without relying on misleading accuracy.

Cross-ValidationFeature EngineeringSupervised LearningCrayon Data
Dimensionality Reduction Trade-offsMedium

Tests ability to compare dimensionality reduction methods by accuracy, interpretability, and computational cost.

Trade-offsFeature EngineeringCrayon Data
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2
Behavioral & Leadership5 questions · ~44 min
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3
More topics11 questions · ~96 min
Top Customers by Sales RevenueEasy
Practice

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsCrayon Data
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchCrayon Data
Statistical Significance in Hypothesis TestingEasy

Explain what statistical significance means and why it matters when interpreting experimental or analytical results.

Hypothesis TestingData AnalysisStatistical SignificanceCrayon Data
Measurable Impact for RecommendationsMedium

Tests ability to define and reason about measurable outcomes for AI recommendations.

Crayon Data
Production Model PerformanceMedium

Tests MLOps thinking: monitoring, drift handling, retraining, and maintaining model quality post-deploy.

model performanceproduction environmentCrayon Data
Designing Engagement MetricsMedium

Tests skill in defining metrics that reflect user engagement and can drive model and product decisions.

user engagementCrayon Data
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Second Highest Without AggregatesHard
Practice
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
Top Products by Sales RevenueEasy
Practice
Practice drill

Find the top 10 products by total sales revenue using joins, aggregation, and a CTE.

RankingGroup ByAggregationsRTXiSmile TechnologiesCatalina
The finish line: interview-readyComplete all 21 questions plus 2 hands-on drills to finish this plan.