$($b$)$ Compute the mean absolute error $($MAE$),$ mean squared error $($MSE$),$ and mean absolute percentage error MAPE$)$

using the most recent value as the forecast for the next period. What is the forecast for month $8?$

$($c$)$ Compute the MAE, MSE, and MAPE using the average of all the data as the forecast for the next period.

What is the forecast for month $8?$

$($d$)$ Develop a three$-$week moving average for this time series and compute the MAE, MSE, and MAPE.

What is the forecast for month $8.$

$($d$)$ Use $=0\mathrm{.}20$ to compute the exponential smoothing values for the time series and compute the

MAE, MSE, and MAPE. What is the forecast for month $8?$

$($e$)$ Compare the results. Which appears to provide the better forecast based on the MSE?