Smoothing constant: $0\mathrm{.}15$

Based on the given information, please compute a four$-$period average forecast for Week $7$ to Week $11$ with the approaches of moving average, weighted moving average, and exponential smoothing. $($with accuracy to two decimal places, $)$

Based on the results of the above question, compare the error performance of these three forecasting techniques using MAD, MSE, and MAPE for the three approaches and identify the best approach for MAD, MSE, and MAPE, respectively. $($with accuracy to two decimal places, $)$

Remark: The answers should demonstrate the process of how to obtain the results.