Sales of roof material, by quarter, since 2002 for Carolina Home Construction, Inc. are shown as following
Year | Quarter | sales |
| 2002 |
| 210 |
| 180 | |
| 60 | |
| 246 | |
| 2003 |
| 214 |
| 216 | |
| 82 | |
| 230 | |
| 2004 |
| 246 |
| 228 | |
| 91 | |
| 280 | |
| 2005 |
| 258 |
| 250 | |
| 113 | |
| 298 | |
| 2006 |
| 279 |
| 267 | |
| 116 | |
| 304 | |
| 2007 |
| 302 |
| 290 | |
| 114 | |
| 310 | |
| 2008 |
| 321 |
| 291 | |
| 120 | |
| 320 |
A.Determine the typical seasonal patterns for sales using the ratio-to-moving-average method.
B.Depersonalizes the data and determine the trend equation.
C.Project the sales for 2009,and then seasonally adjust each quarter.
不知道这道题本身是否表述欠妥,如题目没问题,还请达人对B.C两问如何理解及操作给一些提示,不胜感激


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