A company that manufacturers plastic containers is attempting to select a method of forecasting yearly demand for the next 10 years. The company typically uses forecasts from sales representatives for yearly forecasts. The company has expanded its facilities, doubling capacity over the past years. Sales data for the last fifteen years are readily available. Which of the following forecasting methods would be preferred?
a) Qualitative b) Simple exponential smoothing c) Econometric d) Box-Jenkins