Given the following data, what is MAD$/$MAE for the exponential smoothing forecast with $a=\mathrm{.}2?$ Use a naive forecast as your starting point.

Month Demand

$1,19$

$2,20$

$3,18$

$4,19$

$5,17$

$1\mathrm{.}05$

$1\mathrm{.}5$

$1\mathrm{.}0$

$\mathrm{.}842$