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The manager of a travel agency has been using a seasonally adjusted forecast to predict demand for packaged tours. The actual and predicted values are as follows: Click here for the Excel Data File a. Compute MAD for the fifth period, then update it period by period using exponential smoothing with =.05. (Round your intermediate calculations and final answers to 3 decimal places.) b. Compute a tracking signal for periods 5 through 14 using the initial and updated MADs. (Negative values should be indicated by a minus sign. Round your intermediate calculations and final answers to 3 decimal places.)