Question: Using the data in problem 12, use Holt's double exponential smoothing method to forecast the cost per standardized call for years 8 and 9; let

Using the data in problem 12, use Holt's double exponential smoothing method to forecast the cost per standardized call for years 8 and 9; let a = 0.25 and ẞ = 0.2, and let 1, = 2.40 and S, =-0.12.

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