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 values for periods 1-12 using a single exponential smoothing model with a smoothing constant value equal to 0.20. 
What is the forecast bias value for the model over periods 2-12?
Definitions:
Woodcock-Johnson III
A comprehensive set of assessments designed to evaluate cognitive abilities, academic skills, and achievement.
Test Content Area
The test content area refers to the specific subjects or knowledge domains that are covered by a test.
Prefrontal Cortex
The front part of the frontal lobe of the brain, involved in complex behaviors such as decision making, problem-solving, and controlling social behavior.
Limbic System
The limbic system is a complex set of brain structures located on both sides of the thalamus, involved in emotions, memory, and arousal.
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