Mean Absolute Deviation is a simple way to measure the forecast error. Choose the correct statement(s); O a. It divides the actual over forecast to determine the error O b. All of the options OC. It only works when there is a consistent over-achievement or under-achievement over a period of time d. It compares the cumulative forecast to the cumulative actuals and calculates the error by measuring the difference between the 2 cumulative numbers e. It eliminates the impact of the -ve and -ve signs by considering the absolute value of each error Clear my choice When forecasting for a new product that has no history, planners use the following technique(s): a Market research O b. Calculating forecast error O Moving average Od. Past performance e. All of the options Clear my choice 2:38