Create graph:

$1)$ Use one series of data $($one line$)$ over the entire $3$ year period. Make sure the month$/$year is displayed on the x$-$axis. Use good graphing techniques.

Make a forecast:

$2)$ Determine the annual regression forecast for $2020.$ See tab labeled "Regression."

$3)$ Determine the seasonally adjusted forecast for Jan $2020.$ This will require you to calculate the seasonal index for Jan $2020.$ Then adjust the annual regression forecast that you made for $2020$ into a seasonally adjusted forecast for Jan $2020.$

$4)$ Comment about why this forecast is an appropriate model or not. Use information from the various steps$/$questions above.