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The accompanying data file contains 20 observations for t and yt. Click here for the Excel Data File a. Use the simple exponential smoothing with

The accompanying data file contains 20 observations for t and yt. Click here for the Excel Data File a. Use the simple exponential smoothing with a=0.2 for making forecasts. Note: Do not round intermediate calculations. Round final answers to 2 decimal places. b. Use the in-sample forecast errors to compute MSE,MAD, and MAPE. Note: Do not round intermediate calculations. Round final answers to 2 decimal places. Make a forecast for period 21 . Note: Do not round intermediate calculations. Round final answer to 2 decimal places

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