Non-paramentric statistics...?

Question

Is there a good non-paramentric statistical test for determining significant differences among means?

Answer 1

It is called Welch's t-test. It's a generalisation of Student's t-test where the samples have unequal variances.

http://en.wikipedia.org/wiki/Welch%27s_t_test
http://en.wikipedia.org/wiki/Student%27s_t-test