A manager has been using a certain technique to forecast demand for units of web publishing software for the past six periods. Actual and predicted amounts are shown below. First, calculate the amount of demand using the Naive method, and determine which forecasting method (Naive or existing forecasting technique) has produced better results (based on MSE)? Period Demand Forecast 1 90 87 2 85 88 3 90 86 4 92 89 5 93 90 6 88 90