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[Step-by-Step] International Dairy Queen, Inc., a firm whose business is highly seasonal, has reported the following quarterly net income figures for 1991 through

Question: International Dairy Queen, Inc., a firm whose business is highly seasonal, has reported the following quarterly net income figures for 1991 through 1995.

I II III IV
1991 4.374 8.227 10.185 5.135
1992 4.406 8.674 10.536 4.479
1993 4.548 8.727 10.677 5.936
1994 4.614 9.26 11.164 6.383
1995 4.91 9.848 11.747 6.712
  1. Construct the four-quarter centered moving average for these data and determine the percentages of the moving average for the quarters.
  2. Determine the seasonal indexes for the quarters.
  3. Use the seasonal indexes to deseasonalize the original time series.

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