Table gives the rental vacancy rates by U.S. region (source: U.S. Census Bureau) for 5 years.
|
Table
|
|
|
Rental units
|
1995
|
1996
|
1997
|
1998
|
1999
|
|
Northeast
|
7.2
|
7.4
|
6.7
|
6.7
|
6.3
|
|
Midwest
|
7.2
|
7.9
|
8.0
|
7.9
|
8.6
|
|
South
|
8.3
|
8.6
|
9.1
|
9.6
|
10.3
|
|
West
|
7.5
|
7.2
|
6.6
|
6.7
|
6.2
|
(a) Test at the 0.01 level whether the true rental vacancy rates by region are the same for all 5 years.
(b) If there is a difference, use Tukey's method to ?nd which regions are different.