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Ernst & Young Oman Data Scientist Interview Questions

The questions to prepare for a Ernst & Young Oman Data Scientist interview. Questions from real interview reports rank first. Updated daily.

35questions
~5htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~46 min
Rolling 7-Day Revenue in SQLMedium
Practice
Recently asked

Calculate each active user's rolling seven-day revenue average with daily aggregation and window functions.

Window FunctionsDate FunctionsRunning TotalsErnst & Young Oman
SQL for Monthly KPIsMedium
Practice
Recently asked
Practice drill

Join account data, retain the latest transaction version, and calculate monthly approval KPIs.

Window Functionsdata cleaningJoinsErnst & Young Oman
Second Highest Without AggregatesHard
Practice
Recently asked
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
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2
Machine Learning7 questions · ~60 min
Tune a Model for Better PerformanceMedium
Recently asked

Improve a supervised model by tuning features, validation, and hyperparameters to raise held-out performance.

Hyperparameter TuningCross-ValidationBias-Variance TradeoffErnst & Young Oman
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3
A/B Testing & Experimentation3 questions · ~26 min
Detect Interference in Ops ExperimentHard
Recently asked

Assess whether interference between nearby units could bias an operations experiment and how to test for it.

Network InterferenceExperimentationCausal InferenceErnst & Young Oman
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4
Metrics3 questions · ~26 min
Diagnose KPI Drop After ReleaseMedium
Recently asked

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosisErnst & Young Oman
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5
Product Sense3 questions · ~26 min
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6
Behavioral & Leadership11 questions · ~94 min
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7
More topics5 questions · ~43 min
Conversion Lift Significance TestHard
Recently asked

Use a two-proportion z-test and confidence interval to determine whether an observed conversion lift is real or just sampling noise.

Confidence IntervalsStatistical SignificanceP-ValuesErnst & Young Oman
Improve Model Accuracy SystematicallyMedium
Recently asked

Approach for improving a model's accuracy by checking data, features, validation, and threshold choices.

Cross-ValidationAccuracyThreshold TuningErnst & Young Oman
Real-Time Dashboard Data PipelineMedium
Recently asked

Design a streaming pipeline that keeps dashboard data fresh and accurate for operational reporting.

InfrastructureStream ProcessingOrchestrationErnst & Young Oman
Transformers, Preprocessing, and RAGMedium
Recently asked

Assesses your understanding of transformer concepts and practical LLM system design.

transformersErnst & Young Oman
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The finish line: interview-readyComplete all 35 questions plus 2 hands-on drills to finish this plan.