Revenue passenger-miles are calculated by multiplying the number of paying passengers by the distance flown in thousands.

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Revenue passenger-miles are calculated by multiplying the number of paying passengers by the distance flown in thousands. The accompanying table shows a portion of monthly data on revenue passenger-miles (in millions) from January 2006 through September 2010.

Year...................... Month................... Revenue Passenger-Miles

2006.......................... Jan....................................... 43.1652

2006.......................... Feb....................................... 44.0447

⋮.............................. ⋮............................................... ⋮

2010 ...........................Sep .....................................43.7704

a. Plot the above series and comment on its trend and seasonal variations.

b. Compute seasonal indices and use them to seasonally adjust the series.

c. Fit the appropriate trend model to the seasonally adjusted series.

d. Use decomposition analysis to make monthly forecasts for the last three months of 2010

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