Question: 11

Building on your answers to Review Questions 9.4, use the multiplicative decomposition model to:

A) Find the seasonal factors for each quarter.

B) Calculate the mean squared deviation (MSD) for the model.

C) By contrasting your answer to part (b) with the MSD for the additive model you obtained for Review Questions 9.8 part (b) state which is the better model for the gas consumption series.