Question: Develop a linear regression trendline for the data provided (2008-2015) and provide a regression equation. Use the regression equation from question 1 to obtain forecasted
- Develop a linear regression trendline for the data provided (2008-2015) and provide a regression equation.
- Use the regression equation from question 1 to obtain forecasted sales (FT) for Jan 2015-Dec 2015 (i.e. months 85-96). Insert your forecasted sales in the Regress Sale Forecast (FT) column in the Table 1 below. Next, calculate the forecast errors for Jan 2015-Dec 2015 (i.e. months 85-96). Insert your forecast error values in the Forecast Error (FET) column in Table below. For your submitted you can simply copy and paste the completed Table 1.
Table 1: 2015 Sales Data and Regression Forecast
| Year | Month | Month # (T) | Actual Sales (AT) | Regression Sales Forecast (FT) | Forecast Error (FET) |
| 2015 | Jan | 85 | 12,287 | 14580.29 | 0.19 |
| 2015 | Feb | 86 | 11,519 | 14669.72 | 0.27 |
| 2015 | Mar | 87 | 12,767 | 14759.15 | 0.16 |
| 2015 | Apr | 88 | 13,235 | 14848.57 | 0.12 |
| 2015 | May | 89 | 13,643 | 14938.00 | 0.09 |
| 2015 | Jun | 90 | 13,552 | 15027.43 | 0.11 |
| 2015 | Jul | 91 | 13,349 | 15116.86 | 0.13 |
| 2015 | Aug | 92 | 10,240 | 15206.29 | 0.48 |
| 2015 | Sep | 93 | 14,781 | 15295.71 | 0.03 |
| 2015 | Oct | 94 | 17,123 | 15385.14 | 0.10 |
| 2015 | Nov | 95 | 20,396 | 15474.57 | 0.24 |
| 2015 | Dec | 96 | 23,609 | 15564.00 | 0.34 |
- Use the data obtained in Table 1 to calculate the Mean Absolute Percentage Error (MAPE) for 2015 when using the Regression method to forecast sales.
Info in the table may already be right not sure though!
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