Using simple moving averages and the following time series data, respond to each of the items.

Period Demand

$172$

$260$

$327$

$452$

$526$

$646$

$752$

$828$

$953$

$1050$

$1157$

$1287$

$1322$

$1456$ Compute the MAD for each forecast. $4-$Period MAD

$8-$Period MAD

Note: Round your answers to $2$ decimal places.