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DONE by NONE Data Analyst Interview Questions

The questions to prepare for a DONE by NONE Data Analyst interview. Questions from real interview reports rank first. Updated weekly.

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Diagnose Funnel Drop-Off
Medium

Analyze where users drop off in a product funnel and identify the biggest conversion leak.

AARRR FrameworkFunnel AnalysisConversion Rate
DONE by NONE
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Window Functions for Sequential Data
Hard

Tests advanced SQL window function knowledge for ordered event analysis.

Window FunctionsLag/LeadRanking
DONE by NONE
Choosing SQL Join Types
Easy

Tests understanding of join semantics and correctness in data modeling.

SubqueriesJoinsGroup By
DONE by NONE
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Data Quality in ETL Pipelines
Easy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQuality
DONE by NONE
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A/B Testing for Product Features
Medium

Explain how to design and evaluate an A/B test for a product feature, including metrics, MDE, sample size, and guardrails.

Hypothesis TestingStatistical SignificanceA/B Testing
DONE by NONE
Sample Size and Power Planning
Medium

Reason about sample size, power, and minimum detectable effect before launching an experiment.

Hypothesis TestingPower AnalysisSample Size
DONE by NONE
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