What it does
Builds the full A/B test plan from hypothesis to readout. Forces a specific prediction, calculates required sample size, picks a primary metric, and locks the call before data arrives.
Use it when a team wants to "just test" a copy change or pricing tweak. It will tell you when the test is underpowered, when traffic is too low to ever reach significance, and when a non-test (ship it, watch it) is the smarter move.
Outputs a one-page test brief: hypothesis, variants, sample size, duration, success criteria, what counts as a tie. Pairs with `analytics-tracking` for instrumentation and `page-cro` when the test is on a landing page.
Related skills
/analytics-tracking
Stop guessing whether the funnel works. Instrument it once, decide from data forever.
/page-cro
Diagnose a page against value clarity, headline, CTAs, trust, friction, mobile. Then fix it.
/product-marketing-context
Capture positioning once so every other marketing skill stops asking the same questions.