Exhibit 18.5.Based on quarterly data collected over the last 4 years,the following regression equation was found to forecast the quarterly demand for the number of new copies of an economics textbook: 
, where Qtr1,Qtr2 and Qtr3 are dummy variables corresponding to Quarters 1,2 and 3.
Refer to Exhibit 18.5.Which of the following is not true?
Definitions:
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