Problems: Sales (in thousands of units) of a particular product for the past five years were as follows: 2014 - 48,000 2015 - 53,000 2016 - 62,000 2017 - 81,000 2018 - 83,000 a. What sales would you forecast for 2019 using a simple four year moving average? If actual sales were 76,000 in 2019, what sales would your forecast for 2020? b. What sales would you forecast for 2019 using a weighted moving average with weights of .5, 3, .15, and .05 (with the highest weight on the most recent data)? c. Using exponential smoothing with a weight of .55 on actual values (so alpha=.55): If the forecast for sales in dollars) for another product in 2018 was $45,000 and actual sales were $50,000, what would you forecast for 2019? Suppose actual sales in 2019 are $53,000, what would you then forecast for 2020