Instruction 14-11
the President of a Chain of Department Stores

Instruction 14-11
The president of a chain of department stores believes that her stores' total sales have been showing a linear trend since 1980.She uses Microsoft Excel to obtain the partial output below.The dependent variable is sales (in millions of dollars),while the independent variable is coded years,where 1990 is coded as 0,1991 is coded as 1,etc.
SUMMARY OUTPUT
Regression Statistics
$\begin{array} { l r } \text { Multiple R } & 0.604 \\ \text { R Square } & 0.365 \\ \text { Adjusted R Square } & 0.316 \\ \text { Standard Error } & 4.800 \\ \text { Observations } & 17 \end{array}$
$\quad\quad\quad\quad\quad\quad\quad$ Coefficients
$\quad$ Intercept $\quad\quad\quad\quad 31.2$
$\begin{array} { l l } \text { Coded Year } \quad & 0.78 \end{array}$
-Referring to Instruction 14-11,the estimate of the amount by which sales (in millions of dollars)is increasing each year is ________.