orecast This $($Part $4)$

$$ Forecast using:

$4$ month MA

$3$ month MA using weights of $4,2$ and $1$

$$ Exponential smoothing using alpha of $\mathrm{.}3$ and starting forecast of $125$

$$ What are the MAD for each?

Month Sales

$1120$

$2130$

$3137$

$4135$

$5145$

$6158$

$7160$