Using a weight of 1/2 for the most recent observation, 1/3 for the second most recent, and 1/6 for third most recent, compute a three-week weighted moving average for the time series. Use rounded for two decimal places values for intermediate colculations. Week Sales Weighted Moving Average Forecast Forecast Error (Error)2 1 17 2 21 3 19 4 23 5 18 6 16 7 20 8 18 9 22 10 20 11 15 12 22 Total Compute the MSE for the weighted moving average in part (a). Do you prefer this weighted moving average to the unweighted moving average?