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The table below presents quarterly sales of shampoo, given in liters, over a three years period. Year Quarter Sales Forecast 1 Q1 266 1 Q2
The table below presents quarterly sales of shampoo, given in liters, over a three years period.
| Year | Quarter | Sales | Forecast |
| 1 | Q1 | 266 | |
| 1 | Q2 | 143 | |
| 1 | Q3 | 183 | |
| 1 | Q4 | 119 | |
| 2 | Q1 | 194 | |
| 2 | Q2 | 161 | |
| 2 | Q3 | 175 | |
| 2 | Q4 | 140 | |
| 3 | Q1 | 339 | |
| 3 | Q2 | 250 | |
| 3 | Q3 | 301 | |
| 3 | Q4 | 221 | |
| 4 | Q1 | ? | |
| 4 | Q2 | ? | |
| 4 | Q3 | ? | |
| 4 | Q4 | ? |
- Using Linear Regression with Seasonal Adjustment, what is your forecast of shampoo sales for January of year 4? Please show the detailed calculations.
- After projecting your model in the past, calculate its Mean Absolute Percentage of Error (MAPE).
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To tackle these questions well break down the process into steps Lets start with calculating the forecast of shampoo sales for Q1 of year 4 using Line...
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Project management
Authors: Harvey maylor
4th Edition
027370432X, 978-0273704324
