Forecasts tab: use the data in columns A$-$B and apply the $4$ forecasting models below in columns $C-F($yellow cells$).$ The graph will be created automatically.

$3-$Week$-$Moving$-$Average

$3-$Week$-$Weighted$-$Moving$-$Average $[$wt$-1=0\mathrm{.}5,$wt$-2=0\mathrm{.}3,$wt$-3=0\mathrm{.}2]$

Exponential$-$Smoothing $[$alpha$=0\mathrm{.}25]$

Linear$-$Regression

Next, complete the MAD, MSE & MAPE tabs$.$

MAD tab: Copy the yellow cells from the Forecasts tab into the tan cells. In columns G$-$J $($yellow$),$ find the absolute error for each method on each period $.$ Finally, in row $22,$ calculate the MAD for each method $($over the $15$ rounds$).$

MSE tab: Copy the yellow cells from the Forecasts tab into the tan cells. In columns G$-$J $($yellow$),$ find the squared error for each method on each period $.$ Finally, in row $22,$ calculate the MAD for each method $($over the $15$ rounds$).$

MAPE tab: Copy the yellow cells from the Forecasts tab into the tan cells. In columns G$-$J $($yellow$),$ find the absolute percentage error for each method on each period. Finally, in row $22,$ calculate the MAD for each method $($over the $15$ rounds$).$

What is the best forecasting model?