Click here for the Excel Data File a. Assume the data refer to demand rather than sales. Using trend-adjusted exponential smoothing with in intual forecant of 50 for Day 8, an initial trend estimate of 2 , and ==2, develop demand forecasts for Days 9 through 15 . Then compute the resultant MSE using the error values from Days 8 through 15 . (Round your intermedlate period-by-perlod forecast and error values to 3 decimal places. Round your final MSE answer to 3 declmal places.)