Good point! Although with around N > 25 you're OK. See: http://faculty.chass.ncsu.edu/garson/PA765/binomial.htm http://faculty.chass.ncsu.edu/garson/PA765/bin

Good point! Although with around N > 25 you're OK. See: http://faculty.chass.ncsu.edu/garson/PA765/binomial.htm http://faculty.chass.ncsu.edu/garson/PA765/binomial.htm