Mike's analysis and advice is dead on, per usual. If you want more
information on MR theory (as distinct from how Excel does MR) and how betas
differ from correlations, you'll find a wonderful discussion in Kerlinger &
Pedhazur, a classic published by Holt Rinehart, 1973 -- there's a more
recent edition dated 1986, I think.

BTW, I too have long felt that the coefficients were the slop of the least
squares line (g).

C^2
Conrad Carlberg