The closing value of the AMEX Airline Index for each trading day during a 1-year period is given in the file P16_23.xlsx.   a. How well does the moving average method track this series when the span...

The closing value of the AMEX Airline Index for each trading day during a 1-year period is given in the file P16_23.xlsx.

a. How well does the moving average method track this series when the span is 4 days? When the span is 12 days?


b. Using the more appropriate span, forecast the closing value of this index on the next 15 trading days.