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 formulas should go in cells E3:H16?
Definitions:
Eligible Educator
A teacher or educational professional who meets certain criteria and may qualify for specific tax deductions or benefits.
Student Loan Interest
The cost paid for borrowing money for education, which can sometimes be deductible on federal taxes.
Educational Institution
An organization dedicated to education, such as a school, college, university, or training center.
Self-Employed Taxpayers
Individuals who work for themselves and are responsible for paying their own taxes directly to the IRS.
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