Hello everyone,

I have two samples of data of different sizes. Sample 1 is 30 points and
sample 2 is 20 points. I have no reason to believe that the two sample
are normally distributed or have the same variance. I am looking for
significance test for the null that the two samples have same mean (or
the two samples come from same population). 

I found the unpaired Student's t test for unequal variance. However this
test assumes normality.
The non parametric test I found is the Mann Whitney U test. But this
test requires equal variance.

Any suggestions.

Thanks,
Reena

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