Question: The quarterly production of pinelumber in millions of board feet,by Northwest Lumber since 2004 is:
Quarter
|
Winter
|
Spring
|
Summer
|
Fall
|
|
7.8
|
10.2
|
14.7
|
9.3
|
|
6.9
|
11.6
|
17.5
|
9.3
|
|
8.9
|
9.7
|
15.3
|
10.1
|
|
10.7
|
12.4
|
16.8
|
10.7
|
|
9.2
|
13.6
|
17.1
|
10.3
|
a) Determine the typical seasonal pattern for the production data using the ratio-to-moving-average method.
b) Interpret the pattern.
c) Deseasonalize the data and determine the linear trend equation.
d) Project the seasonally adjusted production for the four quarters of 2009.