H$9\_$b$.$ Exercise $2,$ p$.200($continued from last week$).$ Review H$8\_$b$.$xlsx$,$ and, for the two cases in part a$)$ and b$)$ below that were performed in H$8\_$b last week, answer part c$).$

a$)4-$week moving average $($MA$)$

b$)$ exponential moving average with $a=0\mathrm{.}1($EMA$)$

c$)$ evaluate the MAD, MSE, bias, for case $($a$)$ and $($b$)$ above.

Which method $($MA or EMA$)$ do you prefer? Why?

Hint: compare MSE and MAD for each method and select the one with minimum MSE and MAD. This problem is discussed on slides $49$ and $50$ of Chapter $7$ PP$,$ Part B$.$