Can somebody please respond to 55Dollar5DollarFootLongs post from 3 years ago. I am getting the exact same answers as him and I do not have a clue what I am doing wrong. I used the exact same equations and process as he did and got the exact same answers so I think I have the same issue. Please let me know what I am doing wrong.

[NEAS: That post has arithmetic errors. Recommendation: Use Excel or R to get the results in the homework assignments. For Excel, use the regression add in. For R, use the lm built-in function. In both R and Excel you can compute all the intermediate values as well, to follow the derivation using the formulas in the textbook.]