### Question

Topic: Research/Metrics

## Margin Of Error In Split Tessing

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audience sees Version A of a page and the other half sees Version B. We count how many clicks each version generates and the one with the most clicks wins. For example:

Version Views Clicks CTR

----------------------------------------------

Version A 4,550 2,010 44%

Version B 4,510 1,750 39%

We'd like to stop running the test as soon as we're reasonably sure that we've got a winner but I don't really know when that is. How do we go about determining if the test results are conclusive and meaningful?

Thanks for any assistance!