Originally posted by: sponge008
I think many people are actually underestimating themselves, especially for intelligence. Think of how good Joe Sixpack is at calculus, endurance running, painting, and public speaking, to just use some examples. The bias would probably be from the selective nature of this forum's posters' peer groups: the median university graduate is rather smarter than the median working class laborer.
http://en.wikipedia.org/wiki/Dunning-Kruger_Syndrome
Dunning-Kruger Syndrome leads one to believe that the people on the low/middle end of a curve overestimate their position on the curve, and the people on the high end overestimate.
Intelligence is based on ability to learn, think, and reason.
Education does not affect intelligence.