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Carmax Data Scientist Interview Questions

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

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1
A/B Testing & ExperimentationStart here. 3 questions · ~32 min
Power Analysis for Survey ExperimentHard
Recently asked

Determine sample size and power for a customer survey or experiment, including MDE, guardrails, and a disciplined decision rule.

MDEPower AnalysisSample SizeCCarmax
Design Test for New FeatureMedium
Recently asked

Design an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.

experiment designfeature evaluationA/B TestingCCarmax
Common Pitfalls in Experiment ResultsHard
Recently asked

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

PeekingNovelty EffectSample Ratio MismatchCCarmax
2
Behavioral & Leadership3 questions · ~32 min
Resolving Cross-Functional Product ConflictMedium
Recently asked

Tests conflict resolution in cross-functional product work, including influence, communication, and preserving momentum under disagreement.

Conflict ResolutionStakeholder ManagementCommunicationCCarmax
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3
More topics4 questions · ~43 min
SQL: 7-Day Rolling AverageMedium
Practice
Recently asked

Calculate each CVS store's 7-day rolling sales average using a CTE, aggregation, join, and window function.

Window FunctionsDate FunctionsRunning TotalsCCarmax
Investigate Metric DropMedium
Recently asked

Diagnose a below-expectations product metric drop using decomposition, guardrails, and experiment checks.

metric selectionDiagnosiskpi hierarchyCCarmax
Statistical Significance in Hypothesis TestingEasy
Recently asked

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

Hypothesis TestingData AnalysisStatistical SignificanceCCarmax
SQL for Top Categories by RegionMedium
Practice
Recently asked

Write a query to identify the top three selling product categories for each region in the last fiscal quarter. Assume fiscal quarters align with calendar ...

Date FunctionsJoinsRankingCCarmax

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Hands-on SQL practiceWrite and run real queries in the editor. 1 drill · ~10 min
SQL Join and Revenue AggregationEasy
Practice
Practice drill

Calculate total revenue per customer using GROUP BY, SUM, and descending output ordering.

JoinsGroup ByAggregationsGenpactCCarmax
The finish line: interview-readyComplete all 10 questions plus 1 hands-on drill to finish this plan.