If the groups are independent, I'd use the Games-Howell procedure, which is the multiple comparison analog to the Welch t-test for unequal n's. 

At 12:51 PM 03/30/2003 -0800, Excel wrote:
I am comparing 4 class means.  Each having different sizes.  I have
ran a F-test and there is a significant difference between the means.
I want to run a Post Hoc test to find out which ones.  Do I use Tukey?
 Do you need equal class sizes?  Scheffe?
.
.
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