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Updated weekly · Last refresh Oct 17

Tech(x) Data Analyst Interview Questions

The questions to prepare for a Tech(x) Data Analyst interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 4 questions + 2 drills · ~57 min
Top 5 Users by ActivityMedium
Practice

Identify Tech(x)'s five most active users with a date-filtered LEFT JOIN and grouped activity counts.

sql queryData Analysisuser engagementTech(x)
Optimizing Slow Sales QueriesEasy

Explain how to diagnose and optimize a slow SQL query using execution plans, indexing, and simpler query patterns.

JoinsData WranglingAggregationsTech(x)
Handling Unexpected Join DuplicatesMedium

Evaluates your debugging approach for join logic and data integrity in SQL.

Problem Solvingdata integrityTech(x)
Using Data to Solve ProblemsMedium
Practice
Practice drill

Use campaign data to compare conversion performance and demonstrate a data-driven answer with PostgreSQL.

JoinsData Analysisbusiness problemMicrosoft
Scenario-Based Business CaseHard
Practice
Practice drill

Aggregate project outcomes and present a defensible SQL-based business case analysis.

project experienceJoinsbusiness problemTikTok
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2
Statistics & Probability4 questions · ~37 min
Two Draws Without ReplacementEasy

Compute the probability that two balls drawn without replacement are different colors.

SamplingprobabilityConditional ProbabilityTech(x)
Statistical Significance in Hypothesis TestingEasy

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

Hypothesis TestingData AnalysisStatistical SignificanceTech(x)
Conditional Probability for RetentionMedium

Tests your ability to reason about conditional probability in user retention contexts.

Data Analysisuser retentionConditional ProbabilityTech(x)
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3
Behavioral & Leadership6 questions · ~56 min
Protecting Data Accuracy Under PressureMedium

Tests ownership of data quality in financial analysis, including validation rigor, stakeholder communication, and judgment under regulatory pressure.

financial datadata integrityattention to detailTech(x)
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4
More topics1 question · ~9 min
Design Test for New FeatureMedium

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

experiment designfeature evaluationA/B TestingTech(x)

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