Forecast 5 years sales of souvenir data using Holts-winters and ARIMA methods.
Monthly sales of souvenir shop at a beach resort town in Queensland, Australia, for January 1987-December 1993. Part A) Using the Holts-winters methods and model the data and predict for the next 5 years. Part B) Using the ARIMA method model the data and predict for the next 5 years.