Exhibit 11.21
The following questions use the data below.
A store wants to predict quarterly sales. The owner has collected 3 years of sales data and wants your help in analyzing the data. He wants to use Winter's method to forecast sales. 
-Refer to Exhibit 11.21. What is the forecast for time period 13?
Definitions:
Mouth
The location where a stream, river, or canyon ends, such as where a river enters the sea.
Cross-sectional Area
The area of an object or space as seen from a cut through the object, typically perpendicular to its longest dimension.
Volume
Volume is a measure of the amount of space that an object or substance occupies, commonly expressed in cubic units.
Maximum Sediment Grain Size
The largest diameter of individual grains in a sedimentary deposit, indicating the energy of the transporting medium.
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