Demand forecasting techniques fall into five categories: direct managerial input; best guess; historical ratios; other statistical methods; and scenario analysis. Which of the following is INCORRECT?

Question $21$ options:

a$)$

Best guess involves a managerial judgment process

$$

b$)$

Direct managerial input typically involves a directive that the number of people in the organization or the workforce budget will adhere to a specific number

c$)$

Other statistical methods include regression, linear programming, simulations and demand flow models

d$)$

Historical ratios capture trends in the organization$$s demand for human resources

e$)$

Scenario analysis involves getting a group of experts to provide individual forecasts, which are in turn collated and then sent back to each individual for another round of forecasting