Answer the following questions:

a) Select any 3 alpha values for exponential smoothing forecast, and determine which alpha is the better one using the MAPE to measure the forecasting error

b) Using the alpha found in a), find the forecast for week 25 using exponential smoothing

c) Using the alpha in a), and beta=2, and assuming the general forecast ins 50 calls, and the initial trend is 1, find the forecast for 25 weeks using a trend adjusted exponential smoothing model

d) Using MAPE to measure the forecast error, determine which of the two methods (b or c) is a better method for this data. You are expected to use one of the LOOKUP methods

\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|c|} \hline WEEK & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 \\ \hline C & 50 & 35 & 25 & 40 & 45 & 35 & 20 & 30 & 35 & 20 & 15 & 40 \\ \hline WEEK & 13 & 14 & 15 & 16 & 17 & 18 & 19 & 20 & 21 & 22 & 23 & \\ \hline CALLS & 55 & 35 & 25 & 55 & 55 & 40 & 35 & 60 & 75 & 50 & 40 & 65 \\ \hline \end{tabular}