$4)$ Develop a simple linear regression model based on historical demand data between January $$ October.

a$.$ Use Excel to develop a scatter plot of historical data, with an x$-$axis for time and a y$-$axis for demand.

b$.$ Display the linear trend line and linear regression equation on your chart. Identify the slope and y$-$intercept.

c$.$ Copy your Excel chart with the regression equation and paste it into the file you are submitting in Canvas. $($Only submit one file in Canvas for all problems.$)$