been developed:

$\backslash$begin$\{$tabular$\}\{$ccc$\}$

$\backslash$hline Year & Sales & $\backslash$begin$\{$tabular$\}\{$c$\}$

Forecasted $\backslash \backslash$

Sales

$\backslash$end$\{$tabular$\}\backslash \backslash$

$\backslash$hline $1$ & $455$ & $415\mathrm{.}00\backslash \backslash$

$2$ & $510$ & $427\mathrm{.}00\backslash \backslash$

$3$ & $518$ & $451\mathrm{.}90\backslash \backslash$

$4$ & $563$ & $471\mathrm{.}73\backslash \backslash$

$5$ & $580$ & $499\mathrm{.}11\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$

The MAD for a forecast developed using exponential smoothing with $\backslash (\backslash$alpha$=0\mathrm{.}30\backslash )$ is

sales $($round your response to two decimal places$).$