Exhibit 18-1
Below you are given the first five values of a quarterly time series. The multiplicative model is appropriate and a four-quarter moving average will be used. 
-Refer to Exhibit 18-1. An estimate of the seasonal-irregular component for Quarter 3 of Year 1 is
Definitions:
Traffic Rules
Regulations established by authorities to ensure safe and efficient movement of vehicles and pedestrians on roads.
Sport-Utility Vehicle
A class of vehicle that combines elements of road-going passenger cars with features from off-road vehicles, like increased ground clearance and four-wheel drive.
Personal Fable
A cognitive distortion encountered in adolescence, making individuals believe they are unique, invincible, and not understood by others.
Moral Judgments
Decisions or opinions about what is right and wrong, typically reflecting personal values or societal standards.
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