A regression model is to be developed for predicting the ability of soil to absorb chemicalcontaminants. Ten observations have been taken on a soil absorption index $($y$)$ and tworegressors: x$1=$ amount of extractable iron ore and x$2=$ amount of bauxite. We wish to fit themodel Y $=\backslash$beta $0+\backslash$beta $1$x$1+\backslash$beta $2$x$2+.$ Some necessary quantities are: SST$=1285\mathrm{.}408$