How would you measure billboard impact?

Company: Airwallex

Role: Data Scientist

Category: Analytics & Experimentation

Difficulty: medium

Interview Round: Onsite

Quick Answer: This question evaluates a data scientist's skills in experiment and product design, causal inference (including propensity-score approaches), metric definition and trade-off analysis, power and sample-size estimation, and handling biases such as interference, repeated exposure, and heterogeneous effects.