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Sample sizeWhat it means for you.

The number of visitors or events needed before a test result can be trusted.

Growth Score · Activation

Definition

What it means

The required sample size depends on your current conversion rate and the smallest lift you want to detect. Smaller lifts need far more traffic.

Deciding the number in advance keeps you from ending a test early because it looks good.

In Growth Score

Part of your score

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Guides that cover it

Checkout audit: 12 leaksTwelve places a sale leaks, in cost order, with a test and a fix for each one.When to redesign your siteHow to tell a real redesign need from vanity, and how to do it without losing rankings.Fast for real visitorsRead real visits, then fix images, scripts, layout shifts and the slow start.

Activation

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FAQ

Quick answers

What is Sample size?

The number of visitors or events needed before a test result can be trusted.

Where does it sit in Growth Score?

It belongs to the Activation pillar, one of the 12 pillars your score is built from.

What should I read next?

Start with Statistical significance and A/B testing, then browse the other terms in Activation.

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