Question

Suppose that the last four months of sales were 8, 10, 15, and 9 units, respectively. Suppose further that the last four forecasts were 5, 6, 11, and 12 units, respectively. What is the Mean Absolute Deviation (MAD) of this forecasting period?

A. 2
B. -10
C. 5.5
D. 9
E. 10.5

Answer 1

-25.5

Step-by-step explanation:

First, we find the Mean

= 5+6+11+12=34

Absolute mean value= (5-34) + (6-34) + (11-34) + (12-34) = -102/4=-25.5