## Problem You are given two groups of users: - Group A: North America users - Group B: Europe users Each user has a vector of **continuous** features (e.g., session duration, click-through rate, purchase conversion rate, etc.). ### Task Describe how you would determine whether the two groups differ **significantly in their overall multivariate distribution**. Your answer should cover: - Hypotheses (what does “same distribution” mean?) - Preprocessing/normalization considerations - One or more statistical tests or modeling approaches - How you would report significance and effect size - Pitfalls (multiple testing, confounding, non-IID, heavy tails, missing data)