Sales of roof material by quarter for 2007 through 2013
Sales of roof material, by quarter, for 2007 through 2013, by Carolina Home Construction Inc. are shown below (in $000).

a. Determine the typical seasonal patterns for sales using the ratio-to-moving-average method.
b. Deseasonalize the data and determine the trend equation.
c. Project sales for 2014 using the trend equation and seasonally adjust these values to find the predicted sales for each quarter.
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