The formula for the forecast error is calculated by using the equation: a. Actual demand for period t minus the forecasted demand for period t b. Actual demand for period t divided by the forecasted demand for period t c. Actual demand for period t plus the forecasted demand for period t d. The average of Actual demand for period t and forecasted demand for period t

A. Actual demand for period t minus the forecasted demand for period t

Explanation:

In statistics, forecast is the difference between actual demand and forecast demand and can be stated or represented in absolute value or as a percentage. It is the difference between real and predicted value of time series or any other phenomenon of interest. The value is gotten by subtracting the value of forecast from the outcome.

Forecast error = actual demand - Forecast

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