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Quarterly sales of a department store for the last seven years are given in the following table.
The Excel scatterplot shown indicates that the quarterly sales have an increasing trend and seasonality.Therefore,the linear regression model,Sales = β0 + β1Qtr1 + β2Qtr2 + β3Qtr3 + β4t + ε,with three seasonal dummy variables Qtr1,Qtr2,and Qtr3,and the decomposition method are proposed to make sales forecasts.For the regression model,the following Excel partial output is available.
Using the regression equation for the linear trend model with seasonal dummy variables,what is the sales forecast for the first quarter of Year 8?
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