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Index Analytics Interview Questions

The questions to prepare for Index Analytics interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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Machine LearningStart here. 4 questions · ~32 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 Tradeoff

Index Analytics

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SQL & Data Manipulation3 questions + 3 drills · ~54 min

Cleaning and Preparing Messy DataMedium

Tests data preprocessing skills and practical judgment for turning messy data into reliable inputs.

data preparationdata cleaning

Index Analytics

SQL Duplicate Record DetectionEasy

Practice

Practice drill

Find duplicate American Institutes for Research assessment submissions using a CTE, GROUP BY, HAVING, and joins.

deduplicationsqldata integrity

American Institutes for Research

Macy's

SQL Missing Marks RuleEasy

Practice

Practice drill

Use GROUP BY and HAVING to exclude students missing marks in two or more subjects.

data cleaningsql

PayPal

SQL Window Functions Moving AverageMedium

Practice

Practice drill

Calculate a three-day moving average of active-client revenue using aggregation and SQL window functions.

Window FunctionsData Analysissql

AArete

MITRE

Glassdoor

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Behavioral & Leadership7 questions · ~56 min

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More topics10 questions · ~80 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 Mismatch

Index Analytics

First Checks for Metric DropsEasy

Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.

Lagging IndicatorsLeading IndicatorsDiagnosis

Index Analytics

Define Metrics for New FeaturesMedium

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

MetricsFeature Prioritizationuser value

Index Analytics

Explain Cross-Validation in Model SelectionEasy

Explain what cross-validation is and why it matters when choosing between models.

Cross-ValidationAccuracyThreshold Tuning

Index Analytics

Visualization Tools for Analytics PipelinesEasy

Discuss which visualization tools fit different analytics pipeline needs, and why warehouse integration and monitoring matter.

ToolsData ModelingQuality

Index Analytics

Assessing Statistical SignificanceMedium

Tests hypothesis testing and interpretation of statistical significance in data science work.

Statistical Significanceassessment

Index Analytics

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