Top 14
Prep plan
Updated weekly · Last refresh Oct 17

BlackLocus Data Scientist Interview Questions

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

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1
Machine LearningStart here. 7 questions · ~68 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 TradeoffBlackLocus
Optimization Algorithms and ProcessMedium

Assesses your ability to apply optimization methods and explain your approach end to end.

process improvementBlackLocus
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2
More topics7 questions · ~68 min
Classical Statistics and ProbabilityEasy

Evaluates your fundamentals in statistics and probability used in day-to-day data science work.

behavioral questionsprobabilityBlackLocus
Model Performance MetricsEasy

Tests your knowledge of evaluation metrics and when to use them.

PrecisionAccuracyRecallBlackLocus
Trends and Anomalies DetectionMedium

Tests your data analysis skills for exploratory insights and anomaly detection.

Leading IndicatorsDiagnosisTime SeriesBlackLocus
Optimizing a Slow SQL QueryMedium
Practice

Optimize a PostgreSQL aggregation that finds customers with at least $1,000 in qualifying orders.

database optimizationJoinsindexesBlackLocus
Research MotivationEasy

Tests intrinsic drivers and alignment with sustained research effort and learning.

User NeedsValue PropositionBlackLocus
Linear Regression AssumptionsEasy

Tests your statistical foundations and ability to reason about model validity.

Confidence IntervalsRegressionStatistical SignificanceBlackLocus
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Hands-on SQL practiceWrite and run real queries in the editor. 1 drill · ~10 min
The finish line: interview-readyComplete all 14 questions plus 1 hands-on drill to finish this plan.