If you're interested in this post, the real deal to knowing how much data you need to determine if a test is a valid winner is best measured by standard deviati

If you're interested in this post, the real deal to knowing how much data you need to determine if a test is a valid winner is best measured by standard deviation. Detailed explanation of this in these posts below: http://www.conversionvoodoo.com/blog/what-is-ab-and-multivariable-testing/ http://www.conversionvoodoo.com/blog/what-is-ab-and-multivar... http://blog.joshbaker.com/2009/01/21/standard-deviation-and-marketing-how-why/ http://blog.joshbaker.com/2009/01/21/standard-deviation-and-... http://snaphawk.blogspot.com/2009/07/how-does-google-website-optimizer.html http://snaphawk.blogspot.com/2009/07/how-does-google-website...