In an A/B test, how can you check if assignment to the various buckets was truly random?

To check for random assignment, compare baseline characteristics between groups using descriptive statistics or hypothesis tests (e.g., t-tests for means, chi-square tests for categorical variables).

All covariates (e.g., user age, geography, device type) should be similarly distributed between the groups. If significant differences are found, it could indicate flawed randomization. In such cases, reassigning users or using stratified sampling may be needed.