http://en.wikipedia.org/wiki/Bias_(statistics) http://en.wikipedia.org/wiki/Bias_(statistics) http://en.wikipedia.org/wiki/Variance http://en.wikipedia.org/wik

http://en.wikipedia.org/wiki/Bias_(statistics) http://en.wikipedia.org/wiki/Bias_(statistics) http://en.wikipedia.org/wiki/Variance http://en.wikipedia.org/wiki/Variance Alex, I'd suggest you refrain from opining that standard statistical methods fail in education until after you master basic statistics.