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Quarterly Sales of a Department Store for the Last Seven

Question 56

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Quarterly sales of a department store for the last seven years are given in the following table. 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 = β<sub>0</sub> + β<sub>1</sub>Qtr1 + β<sub>2</sub>Qtr2 + β<sub>3</sub>Qtr3 + β<sub>4</sub>t + 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. (Use Excel or statistical software. )Using the decomposition method: a.Compute the adjusted seasonal indices for the four quarters. b.Find the linear trend equation for the seasonally adjusted quarterly sales. c.Make the sales forecasts for the first and fourth quarter of Year 8. 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 = β<sub>0</sub> + β<sub>1</sub>Qtr1 + β<sub>2</sub>Qtr2 + β<sub>3</sub>Qtr3 + β<sub>4</sub>t + 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. (Use Excel or statistical software. )Using the decomposition method: a.Compute the adjusted seasonal indices for the four quarters. b.Find the linear trend equation for the seasonally adjusted quarterly sales. c.Make the sales forecasts for the first and fourth quarter of Year 8. 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. 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 = β<sub>0</sub> + β<sub>1</sub>Qtr1 + β<sub>2</sub>Qtr2 + β<sub>3</sub>Qtr3 + β<sub>4</sub>t + 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. (Use Excel or statistical software. )Using the decomposition method: a.Compute the adjusted seasonal indices for the four quarters. b.Find the linear trend equation for the seasonally adjusted quarterly sales. c.Make the sales forecasts for the first and fourth quarter of Year 8. (Use Excel or statistical software. )Using the decomposition method:
a.Compute the adjusted seasonal indices for the four quarters.
b.Find the linear trend equation for the seasonally adjusted quarterly sales.
c.Make the sales forecasts for the first and fourth quarter of Year 8.

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