Question 10 2 points Save Answer A manager has been using a certain technique to forecast demand for gallons of ice cream for the past six periods. Actual and forecasted amounts are shown below. Period Demand Forecast 1 85 90 2 80 76 3 65 60 90 88 5 105 98 6 110 95 What is the sigma (or standard deviation) for this forecasting technique? O6.069 O 7.089 O None of the other choices are correct. O5.035 O8.295 G 4 Question 11 2 points Save Answer A manager has been using a certain technique to forecast demand for gallons of ice cream for the past six periods. Actual and forecasted amounts are shown below. Period Demand Forecast 1 85 90 2 80 76 3 65 60 4 90 88 5 105 98 6 110 95 If the errors are assumed to be normally distributed with CL=0, LCL= -4.5 and UCL= +4.5, the errors O All periods are out of control O Period 1, 3, 5 and 6 O None of the other choices are correct O Period 4 only O Period 1 and 3