Interesting article but I want to know what their sample sizes are for the test groups. 9% conversion rate means I wouldn't put much weight on the numbers unle

Interesting article but I want to know what their sample sizes are for the test groups. 9% conversion rate means I wouldn't put much weight on the numbers unless the group sizes were >5000 visits (~450 sales). I think any lower and you start running the risk of drawing conclusions from natural statistical variance.