The Zocor Company is interested in forecasting period 13 sales for a product.It has 12 months of historical data.The following shows the data and the forecasted valued for periods 1-12 using a single exponential smoothing model with a smoothing constant value equal to 0.20 
What is the value of the MAD for periods 2-12?
Definitions:
Factorial Design
An experimental design used to evaluate the effects of two or more independent variables on a set of dependent variables.
Independent Variables
Independent variables are the factors in an experiment that are manipulated or changed by the researcher to observe their effects on the dependent variable.
Interaction
Interaction can describe the reciprocal effect of two or more variables on each other in a study, or the communication and influence between individuals in social psychology.
Factorial Design
An experimental setup that allows researchers to study the effects of two or more independent variables on a dependent variable simultaneously.
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