Sales of roof material, by quarter, for 2007 through 2013, by Carolina Home Construction Inc. are shown below ...

      Sales of roof material, by quarter, for 2007 through 2013, by   Carolina Home Construction Inc. are shown below (in $000).   Quarter          Year Ⅰ Ⅱ Ⅲ Ⅳ      2007 210 180 60 246      2008 214 216 82 230      2009 246 228 91 280      2010 258 250 113 298      2011 279 267 116 304      2012 302 290 114 310      2013 321 291 120 320      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.