Click here for the Excel Data File a. Assume the data refer to demand rather than sales. Using trend-adjusted exponential smoothing with an initial forecast of 46 for Day 8 , an initial trend estimate of 2 , and ==.3, develop demand forecasts for Days 9 through 16 . Then compute the resultant MSE using the error values from Days 8 through 15 . (Round your intermediate period-by-period forecast and error values to 3 decimal places. Round your final MSE answer to 3 decimal places.)