Can anyone elaborate more about this:
=
[Math]\sum_{i=1}^nVar[(Y_i-\overline{Y}-b_1(X_i-\overline{X}))^2][/tex]
How is the 2nd term combine into the variance?
To be more specified: This is the intermediate step in proving [LaTeX ERROR: Convert failed] in regression study. furthermore, [LaTeX ERROR: Convert failed]