Using the following data: Forecast Period 1 2 3 Demand 122 121 143 122 134 137 139 4 5 6 7 127 130 134 a. Forecast period 8 using the moving average technique: n=4 (1.2 points) b. Suppose this forecast results in error of 1 unit. Forecast period 9: n=4 (1.2 points) c. If the Thiel U statistic is 82 for the moving averages forecast. The moving averages forecast for this data is better than nave? True or false, justify your response (0.6 points) d. Forecast period 8 using the cumulative mean technique (1 points)