(2)因为x┴-=18,y┴-=5.4,(∑┬(i=1))┴5 x_i^2=1660,(∑┬(i=1))┴5 y_i^2=327,(∑┬(i=1))┴5xiyi=620,
所以=((∑┬(i=1))┴5 x_i y_i-5 x┴- y┴-)/((∑┬(i=1))┴5 x_i^2-5x ̅^( ^2 ) )=-1.15,=y┴--x┴-=26.1.
即所求回归直线方程为:=-1.15x+26.1.
(3)因为(∑┬(i=1))┴5(yi-)2=0.3,(∑┬(i=1))┴5(yi-y┴-)2=51.2,
所以R2=1-≈0.994,
故回归模型的拟合效果较好.
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