Johnson Company Has Provided the Following Data for the First

Multiple Choice

Johnson Company has provided the following data for the first five months of the year:
$\begin{array} {|l | r | r | } \hline & \text { Machine Hours } & \text { Lubrication Cost } \\\hline \text { January } & 120 & \$ 750 \\\hline \text { February } & 160 & 800 \\\hline \text { March } & 200 & 870 \\\hline \text { April } & 150 & 790 \\\hline \text { May } & 170 & 840 \\\hline\end{array}$


-Using the least squares regression method,the estimated variable lubrication cost per machine hour is closest to which of the following?

A) $0.67.
B) $1.56.
C) $1.40.
D) $1.50.