C04 · Lesson 7 of 22 · 15 min · 6 hands-on tasks
Designing Tests: Sample Size and Power
Dana wants to test a $500 referral credit next. Before spending months on it, Kofi asks: could this test even find the effect? Work out power and sample size, see why small tests miss real effects, and learn the two classic ways to fool yourself: peeking at results early and running many tests at once.
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