5. Sue Sayer is employed as a forecasting analyst for the Barry M. Stiff Casket Corporation. Ms. Sayer has collected the following sales data on Stiff's best-selling casket, Model 12-A: \( 8 \lcm{39} \) 947 a. What's the four-period moving average forecast for period 7 made at the end of period 6 ? b. If the forecast for period 1 were 30 , what would be the forecast for period 2 made at the end of period 1 , using basic exponential smoothing and a smoothing constant of =0.2? c. If the base at the end of period 7 were 53 and the trend at the end of period 7 were 2(=0.2,=0.3), what would be the forecast for period 9 made at the end of period 8 ? d. Given the model described in c, what would be the forecast for period 11 made at the end of period 9 ? e. Given the model described in c and d, what would be the forecast for period 12 made at the end of period 9 ? f. What would be the mean absolute deviation of forecast errors, given that forecasts for periods 6,7,8, and 9 were 55,51,45, and 50 , respectively