Consider the Regression Equation $\hat { y } = 18.321 + 3.762 ( t )$

Essay

Consider the regression equation $\hat { y } = 18.321 + 3.762 ( t )$ and the data below: $$\begin{array} { | l | l | } \hline \text { Time Period } ( t ) & \text { Sales } ( \hat { y } ) \\\hline 1 & 22 \\\hline 2 & 27 \\\hline 3 & 23 \\\hline 4 & 31 \\\hline 5 & 45 \\\hline 6 & 47 \\\hline 7 & 45 \\\hline 8 & 42 \\\hline\end{array}$$
-Compute the forecast errors for period 6 and 7.