Your manager is trying to determine what forecasting method to use. Based on the following historical data, calculate the following forecast, and specify what procedure you would use.

$\backslash$table$[[$Month$,$Actual Demand$],[1,62],[2,65],[3,67],[4,68],[5,71],[6,73],[7,76],[8,78],[9,78],[10,80],[11,84],[12,85]]$

Calculate the overall mean absolute deviation for the forecasts made in questions $1-4.$ Place answers in the table. $($Round your answers to $3$ decimal places$)(8pts)$

$\backslash$table$[[,$Mean Absolute Deviation $($MAD$)],[$Three$-$month moving average,$],[$Three$-$month weighted moving average,$],[$Simple exponential smoothing forecast,$]]$