Problem $4$: $(30$ points$)$ Data on sales revenues $Y($in millions$),$ television advertising expenditures $x_1($in millions$)$ and print media advertising expenditures $x_2($in milions$)$ for a larger retailor for the period $1988-1993$ are analyzed. Use the following information to answer the questions.

$SST=26\mathrm{.}83\frac{?}{?}$Problem $4$: $(30$ points$)$ Data on sales revenues $Y($in millions$),$ television advertising expenditures $x_1($in millions$)$ and print media advertising expenditures $x_2($in milions$)$ for a larger retailor for the period $1988-1993$ are analyzed. Use the following information to answer the questions.

$SST=26\mathrm{.}83\frac{?}{?}$