$5.$ Determine the mean absolute deviation for a forecast for the $3-$week moving average.

Mean Absolute Deviation $($MAD$)=|$Error$|/$ n

Here: $|$Error$|=|$Actual $-$ Forecast$|$

We have already calculated the forecast using $2-$week moving average $($Q$2),$ using that:

MAD $=$

a$.$

$6\mathrm{.}67$

b$.$

$8\mathrm{.}60$

c$.$

$8\mathrm{.}86$

d$.$

$9\mathrm{.}04$

$6.$ Determine the mean absolute deviation for the weighted moving average.

a$.$

$5\mathrm{.}80$

b$.$

$6\mathrm{.}04$

c$.$

$6\mathrm{.}22$

d$.$

$6\mathrm{.}40$