Alpha.20Beta.30 5. Find the Error in Period 20. 6. Using the trend adjusted model above, with the alpha and beta values provided, develop a forecast for period 28. 7. Using the data in the model, develop a six-period moving average for period 26. 8. Using the data in the model, develop a forecast for period 27 using a weighted moving average model with weights of 0.5,0.2,0.2,0.1 (with the first weight on the most recent data)