QUESTION 3: Forecasting 2002 sales (40%) We are now in JULY 2002, and you wish to use the complete time series (Apri 1997 to June 2002) to forecast the last 6 months for the year 2002 (periods 64 to 69) You choose to apply an additive model to prepare the forecast and to use the trend line computed with a linear regression for periods 1 to 63. 3.1. What are the seasonality coefficients, assuming that they are supposed to be the average of the seasonality coefficients for similar periods of the past TWO seasons? Months J ul-02 Aug-02 Sep-02 Oct-02 Nov-02 Dec-02 Coeffient