Test design Articles — Atticus Li

Atticus Li

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Test design

Articles exploring test design through the lens of behavioral science and experimentation. Practical frameworks for growth leaders who measure in revenue, not vanity metrics.

2 articles

one-tailed test Mar 27, 2026 6 min read

One-Tailed vs Two-Tailed Tests: Does It Actually Matter?

Understand the difference between one-tailed and two-tailed hypothesis tests in A/B testing, when each is appropriate, and the simple conversion rule between them.

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A/B/n testing Mar 27, 2026 8 min read

A/B/n Testing Explained: When and Why to Test Multiple Variants

Learn what A/B/n testing is, how traffic splits work with three or more variants, when you need multiple variants, and the tradeoffs compared to simple A/B tests.

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