this is really flawed logic. i hope no one takes this advice. including todd. here is sample size calculator - http://www.surveysystem.com/sscalc.htm http://

this is really flawed logic. i hope no one takes this advice. including todd. here is sample size calculator - http://www.surveysystem.com/sscalc.htm http://www.surveysystem.com/sscalc.htm if he had 100 clicks and 3 buys, then his margin of error with 95% certainty is +/- 3.4% - maybe that's enough to make a difference? but more importantly, companies like twitter never happen under this methodology. i guess this may be sort of ok to use for incremental products, but nothing big will ever be developed this way.