Statistical Significance
Confidence that a measured difference is real rather than noise. Requires more data than small-site tests usually have.
Free · no signup · last reviewed August 29, 2026
The definition
Confidence that a measured difference is real rather than noise. Requires more data than small-site tests usually have.
Why it matters to an owner
The protection against fooling yourself with a decimal point: under ~100 conversions per variant, your A/B test is astrology. Make bolder changes and judge over longer windows instead.
Keep going
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This is the work. Want it done?
Everything here is free to use yourself. That’s the point. If you’d rather a senior marketer just handle it, in your accounts and your name: 20-minute call, no pitch deck.