Question: Use the training set to implement the Holt exponential smoothing method with user - supplied ( alpha = 0 . 2 0 and

Use the training set to implement the Holt exponential smoothing method with user-supplied (\alpha =0.20 and \beta =0.15), as well as the computer-generated, smoothing parameters and compute the resulting performance measures for the validation set.
Note: Do not round intermediate calculations. Round final answers to 2 decimal places.
b-1. Determine the preferred smoothing parameters for making the forecast?
b-2. Reestimate the preferred model with the entire data set to forecast the population in Japan for 2020(in millions).
Note: Do not round intermediate calculations. Round final answers to 2 decimal places.

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