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Exhibit 18.6.Based on quarterly data collected over the last 5 years,the following regression equation was found to forecast the quarterly demand for the number of new copies of a business statistics textbook: , where Qtr1,Qtr2 and Qtr3 are dummy variables corresponding to Quarters 1,2 and 3,and t = time period.
Refer to Exhibit 18.6.For a given year,the demand in Quarter 3 is on average
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