1.Calculate a 3-months simple moving average, for each possible month of years 2019/2020/2021. Calculate the MAD, MSE and MAPE for this method. In addition to the formulas in the computer, show one manual calculation of a forecast of this method, for any month you choose (10 marks)

2.Calculate a 3-months weighted moving average with weighting of 5, 3, 2, for each possible month of year 2019/2020/2021. (5 for last month, 3 for the month before last, 2 for two months before last). Calculate the MAD, MSE and MAPE for this method. Show one manual calculation of a forecast of this method, for any month you choose. (15 marks)

3.Using the exponential smoothing method with ? = 0.8, calculate the forecast for each possible month of year 2019/2020/2021. Calculate the MAD, MSE and MAPE for this method. Assume that the forecast for January 2019 was 50. Show one manual calculation of a forecast of this method, for any month you choose. (15 marks)