Which method uses an arithmetic mean to forecast the next period? Naive Hoving averages Adaptive filtering None of the above QUESTION 14 Simple-exponential smoothing models are useful for data that have a downward time trend. an upward time trend. neither an upvard or downward time trend neither an upward or dovnvard time trend pronounced seasonality All the above. Solution Question 13: Moving averages Question 14: Pronounced seasonality Question 15: Exhibits a rather high degree of trend Question 16: A moving average model Question 17: Moving average.