Question

Use the table that shows the years of experience for eight sales representative and their sales during a given period of time.

Find the prediction equation

Short answer

The prediction equation is $y=\frac{4}{7000}x+\frac{6}{7}$.

Step-by-step solution

identify two points representative for best fit line 

The slope is

$\begin{array}{l}m=\frac{y_2-y_1}{x_2-x_1}\\ m=\frac{6-2}{9000-2000}\\ m=\frac{4}{7000}\end{array}$

substitute on of the points 

Substation of the point in the above equation

$\begin{array}{l}y=mx+c\\ y=\frac{4}{7000}x+b\end{array}$

solve for b for complete prediction 

X=9000

Y=6

$\begin{array}{l}6=\frac{4}{7000}9000+b\\ b=\frac{6}{7}\end{array}$

On substituting the value of b

$y=\frac{4}{7000}x+\frac{6}{7}$