Design an A/B test for a search ranking change
Last updated: February 12, 2026
Quick Overview
Design an experiment to test the impact of new pricing tiers. Include sample size calculation, metrics, and analysis plan.
Supabase
February 12, 2026101
5
4,091 solved
Design an experiment to test the impact of new pricing tiers. Include sample size calculation, metrics, and analysis plan.
Supabase values data-driven decision making. This Technical Screen question assesses whether you can design experiments, interpret results correctly, and avoid common statistical pitfalls like p-hacking or Simpson's paradox.
What the Interviewer Expects
- Derive results from first principles when needed
- Handle complex scenarios with multiple interacting variables
- Design experiments that account for real-world complications
- Discuss advanced topics: Bayesian methods, causal inference, resampling
- Connect statistical concepts to business decision-making
- Identify subtle errors in reasoning (Simpson's paradox, survivorship bias)
Key Topics to Cover
How to Approach This
- Define your hypotheses (H0 and H1) clearly before performing any test.
- Calculate required sample size BEFORE running an experiment, using power analysis.
- Remember the Central Limit Theorem: sample means become approximately normal with large n.
- Watch for Simpson's paradox. Always segment data by key dimensions.
- Distinguish between statistical significance and practical significance.
Possible Follow-up Questions
- How would you handle multiple comparisons?
- How would you explain this result to a non-technical audience?
- What alternative statistical method could you use here?
- What if the sample size is very small?
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Browse Statistics QuestionsSample Answer
Problem Formulation
To design an A/B test for the impact of new pricing tiers on user engagement and conversion rates, we need to establish a clear hypothesis framework:
- Null Hypothesis (H0): The new pricing tier...
Solution Approach
- Sample Size Calculation: Using a two-proportion z-test for conversion rates, we can calculate the required sample size.
- Assume current conversion rate (p1) is 5% (0.05) and we want to test...
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