1. What is an auto regressive model? How is knowledge of Sunspot models useful in this regard? What does ARIMA mean? What is the Box-Jenkins model? Please illustrate and explain.
2. What is meant by simulation? What is the rule for large sample simulation using uniform and normal distribution? Please illustrate and explain.
3. The USA has a relatively high proportion of promotional expenditures on sales promotion. Why do you think that sales promotions play a more important role in the USA?