phData Data Scientist Interview Questions
The questions to prepare for a phData Data Scientist interview. Questions from real interview reports rank first. Updated weekly.
Design a checkout A/B test and compute the sample size needed to detect a 2% relative lift in purchase conversion within 14 days.
phDataExplain practical strategies for handling missing data and how to validate that the chosen approach improves model performance.
phDataRank Genesys Cloud customers by completed revenue using aggregation, a CTE, and ROW_NUMBER().
GenesysphData
CGI GroupCompute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.
Gain Digital
TCS
Zest AIAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin MooreExplain what cross-validation is and why it matters when choosing between models.
phDataInvestigate why a key KPI moved the wrong way after a product change and separate signal from noise.
phDataExplain how to test whether an observed experiment lift is real using hypothesis testing, p-values, and confidence intervals.
phDataApproach for maintaining data quality and integrity across ETL pipelines.
phDataFramework for choosing a feature's primary success metric and guardrails before launch.
phDataAssesses your thinking about monitoring, retraining, and operational reliability for models.
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