$($Bonus$)$ Problem $8(10$ p$)$:

Using the least square trend$-$projection $($regression$)$ method, develop a forecast for the sales of Volkswagens in Nevada through year $6.$

hat$(y)=a+bx$

$b=\frac{{\displaystyle \underset{?}{\overset{?}{}}}xy-n(\stackrel{}{x})(\frac{?}{\text{b}\text{a}\text{r}}(y))}{{\displaystyle \underset{?}{\overset{?}{}}}{x}^2-n{\stackrel{}{x}}^2}$

$a\frac{?}{b}=ar(y)-b\stackrel{}{x}$

$x=3,Y=522$

$\backslash$table$[[$Year $($x$),$Sales $Y,x^2,xY$