Final answer:
The use of group interaction is an important element in successful sales forecasting using the Delphi technique.
Step-by-step explanation:
Out of the statements provided, statement 2) is true: The use of group interaction is an important element in successful sales forecasting using the Delphi technique. The Delphi technique is a forecasting method that involves a group of experts who exchange opinions and ideas to reach a consensus on the sales forecast. This technique leverages the collective knowledge and insights of the group to make more accurate predictions.