Stats & Product Analytics for Analysts
Back to A/B Testing in Practice

Sample-Size Napkin Math Quiz

Test what you just read.

2 minutesInteractive tutorial
🎯 Free Guest Mode: You are learning for free. Sign in to save your completion progress and quiz answers.
Question 1 of 3Answer saved0 answered

Your baseline conversion rate is 10%. You want to detect a +1 percentage point lift (10% → 11%). Roughly how many users per arm do you need (80% power, α = 0.05)?

← Back to Sample-Size Napkin Math