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Prep plan
Updated weekly · Last refresh Aug 30

B Lab Global Data Scientist Interview Questions

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

31questions
~4htotal time
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1
PipelinesStart here. 3 questions · ~26 min
2
A/B Testing & Experimentation3 questions · ~26 min
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 MismatchB Lab Global
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3
Statistics & Probability4 questions · ~35 min
Choosing a Significance TestEasy

Explain how to choose an appropriate significance test based on metric type, study design, and the null hypothesis.

Confidence IntervalsHypothesis TestingStatistical SignificanceB Lab Global
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4
Machine Learning5 questions · ~43 min
Handling Pressure and L1/L2 RegularizationMedium

Assesses your self-presentation, resilience under pressure, and core ML fundamentals.

RegularizationbehavioralB Lab Global
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5
Behavioral & Leadership10 questions · ~86 min
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6
More topics6 questions · ~52 min
Compare Weekly User Activity TrendsMedium
Practice

Aggregate user activity by week, then use LAG to compare sessions and watch time versus the prior active week.

Window FunctionsLag/LeadDate FunctionsB Lab Global
Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser valueB Lab Global
Diagnose Churn by Customer SegmentMedium

Investigate why one customer segment drives most churn and what actions to take.

User SegmentsChurnDiagnosisB Lab Global
Linking Classification to Business OutcomesMedium

Evaluates your ability to connect model metrics to real-world impact and decision-making.

PrecisionAccuracyRecallB Lab Global
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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 31 questions plus 2 hands-on drills to finish this plan.