Is there any reasonable, clear explanation(demonstration, proof??) of the formulas for the standard error of the slope of the least squares regression line? The text I use suggests using "some algebra using rules for variances." I've tried several approaches but wound up going in circles. I'm at the point of thinking that it's so obvious I'm missing something, or too complicated for a novice statistician to see.
Rhonda Weissman Benjamin Cardozo H. S. Bayside, Queens, N. Y.
(Yes, we do teach advanced placement classes in NYC!)