4. Use exponential smoothing with a smoothing constant of 0.8 to predict period 7 sales based on the data below. Then forecast sales with a smoothing constant of 0.2. (Note: the sales forecast for period 6 was 40). Period 3 4 5 6 24 32 44 24 30 42 After determining the forecast based on exponential smoothing, calculate a forecast for Period 7 using the following methods: Nave Ratio Method 3-period moving average 3-period Weighted Moving Average (weights are .5,.3,and .2 with the most recent period weighted heaviest)