Diagnose Sudden Drop in Credit-Card Approval Rate
AffirmData Scientist · Technical Screen
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This interview question evaluates metric design, causal reasoning, experiment setup, diagnostics, SQL/statistical checks, and recommendations in a realistic interview setting. A strong answer for Diagnose Sudden Drop in Credit-Card Approval Rate states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Scenario
Fraud Risk – Sudden drop in credit-card approval rate
Question
Our approval rate has been stable for months and suddenly dropped in a single day. How would you diagnose the root cause? Outline your investigative steps, data needed, and potential hypotheses.
Hints
Consider traffic mix, rule or model changes, data pipeline issues, seasonality, and experiment effects.
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