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Please answer using Microsoft Excel: Problem 4: (30 Marks) Use the demand data that covers a three-year period and is separated by quarters, as indicated

Please answer using Microsoft Excel:
Problem 4: (30 Marks) Use the demand data that covers a three-year period and is separated by quarters, as indicated below: a) Use the decomposition method to forecast the demand for each quarter of Year 4 (quarter 1, quarter 2, quarter 3, and quarter 4). Ensure your Excel file includes the necessary columns: Seasonal Index, Deseasonalized Forecast (Forecast for future periods using the trend line) and Decomposition Forecast. (25 Marks) b) Calculate the Mean absolute deviation (MAD) for the decomposition forecast

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