"Required:

$1.$ Calculate the forecast using $3-$year moving average $($MA$)$

$2.$ Calculate the forecast using $3-$year weighted moving average $($WMA$)$

$3.$ Calculate the mean absolute diviation based on MA and WMA. Which one give you closest forecast using MAD. Show the graph also.

$4.$ Calculate the Exponentially Smoothed Forecast for each month. Assume an an initial forecast of $9$ units in Jan. Use smoothing constand a $=0\mathrm{.}3,$ a $=0\mathrm{.}6,$ and a $=0\mathrm{.}85.$

$5.$ Which smoothing constant give you closest forecast. Using MAD and graph.

$6.$ Calculate the trend projection $"$