Given the data of Exercise 18.13, (a) determine the monthly seasonal indexes for January through December, then
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2007 4.574.75.0 5.0 4.4 2008 5.44.9 2009 5.85.8 6.6 6.5 6. 6.7 5.3 5.6 5.4 5.4 2007 4.7 2008 5.55.4 2009 6.7 6.7 4.9 4.6 5.4 4.8 5.2 5.7 6.3 5.3 6.3 6.9 74 6.6 7.4
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