The Chart Shows Second Quarter Total Retail E-Commerce Sales in the U.S

Short Answer

The chart shows second quarter total retail e-commerce sales in the U.S. in 2001, 2003 and 2005 ( $$t = 0$$ represents 2001). Find the regression line. Round coefficients to two decimal places. $$\begin{array} { | l | l | l | l | } \hline \text { Year } \boldsymbol { t } & 0 & 2 & 4 \\\hline \text { Sales (S Billion) } & 8 & 13 & 20 \\\hline\end{array}$$ ​
y = __________ t + __________
Use the regression line to estimate second quarter retail e-commerce sales in 2002. Round your answers to two decimal places if necessary.
$__________ billion