Compare your forecasting errors from Parts I and II$.$ Which forecasting errors are larger

$($Part I or Part II$)?$ Explain why.

Which forecasting errors are more realistic $($Part I or Part II$)?$ Explain why.

Would you rather use the demand data for the years $2006-2008$ or for the years $2006-2010$

in order to make demand predictions for the year $2011?$ Explain why.