There have actually been a few academic studies on this topic by Vivek Wadwha and the Kauffman foundation:
"An Ivy League degree may get you a job as an investment banker or VC, but it won’t increase your odds of becoming a successful entrepreneur."
"In other words, 81% of the tech company founders came from “regular” schools. To make my colleagues at Harvard feel better (and to keep my job), I’ll acknowledge that the Ivies represented 8% of the sample even though those schools only graduate 1.6% of American students."
http://techcrunch.com/2009/10/24/got-degree-envy-no-worries-...