Design an experiment to evaluate an onboarding progress bar

## Scenario In a QuickBooks-like onboarding flow, the product team adds a **progress bar**. The onboarding has 4 steps: 1. Onboard 2. Send payment 3. Set up bank account 4. File the tax ## Question How would you evaluate whether the progress bar **helps**? Your answer should include: - Hypothesis and what “helps” means - Primary metric + diagnostic metrics + guardrails (with tradeoffs) - Experiment design (randomization unit, sample size/power considerations at a high level, duration) - Key pitfalls (novelty effects, instrumentation, segment heterogeneity) and how you’d address them