A major amusement park has the following number of visitors each quarter from 2005 through 2009:

a. Construct the four-quarter centered moving average for these data and determine the percentages of the moving average for the quarters.
b. Determine the seasonal indexes for the quarters.
c. Use the seasonal indexes to deseasonalize the original time series.

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Number of Visitors (Thousands) 2005 2006 2007 2008 2009 155 182 160 210 225 231 255 250 310 325 270 315 280 365 384 IV 105 294 297 335 386