Diagnose unbiasedness in a messy A/B test
Company: Google
Role: Data Scientist
Category: Analytics & Experimentation
Difficulty: hard
Interview Round: Technical Screen
Quick Answer: This question evaluates a data scientist's ability to diagnose unbiasedness of an intent-to-treat (ITT) estimator in A/B testing under noncompliance, missing logs, interference, and early stopping while reasoning about causal assumptions and potential bias direction.