Use Holt-Winter’s additive method to create a seasonal model that minimizes the MSE for the data set. Use Solver to determine the optimal values of α, β, and γ.

a. What are the optimal values of α, β, and γ?

b. Prepare a line graph comparing the predictions from this method against the original data.

c. What are the forecasts for each quarter in 2006 using this technique?