$(1)$ Complete the table for each forecasting method. The first two rows in each of the tables are provided for you to guide your calculations.

Note:

$($i$)$ Use a $5-$month moving average $($MA$(5))$ for the moving average method.

$($ii$)$ Use the following weights to construct a $5-$month weighted moving average: $5/15,4/15,3/15,2/15,1/15.$

$($iii$)$ Use W $=\mathrm{.}3$ for the exponential smoothing method.