For problems 4 through 6, use the following time series data: MONTH DEMAND January 2019 119 February 72 March 113 April 82 May 82 June 131 July 111 August 116 September 89 October 95 November 88 December 90 4. (**) Develop a three-period moving average forecast for April 2019 through January 2020. Calculate the MFE, MAD, and MAPE values for April through December 2019. 5. (**) Develop a two-period weighted moving average fore- cast for March 2019 through January 2020. Use weights of 0.6 and 0.4, with the most recent observation weighted higher. Calculate the MFE, MAD, and MAPE values for March through December. 6. (**) Develop an exponential smoothing forecast (a = 0.3) for February 2019 through January 2020. Assume that your forecast for January 2019 was 100. Calculate the MFE, MAD, and MAPE values for February through December 2020.