25) Which ones are forecasting techniques? a. regression analysis b. Delphi c. time-series models d. all of the above 26) 2. One of the following methods is a causal forecasting model. Which one? a. exponential smoothing b. regression analysis c. Delphi model d. sales force composite 27) Trend projection is an example of a) Delphi process. b) time series. c) causal methods. d) regression analysis