Question #$3-$ Part $1$

Use the following data for "Sales" to construct a forecast using a

$3-$Period Moving Average. Calculate the "Mean Squared Error

$($MSE$)",$ the "Mean Absolute Deviation $($MAD$)"$ and the "Mean

Absolute Percentage Error $($MAPE$)".$ Round your forecasts to $2$

decimal places.

Question #$3-$ Part $2$

Use the data above for "Sales" to construct a forecast using

Exponential Smoothing with $=\mathrm{.}25.$ Calculate the "Mean

Squared Error $($MSE$)",$ the "Mean Absolute Deviation $($MAD$)"$

and the "Mean Absolute Percentage Error $($MAPE$)".$ Round

your forecasts to $2$ decimal places.