# Thread: Which Significnce Tsting Method to Use

1. Hi, I am pretty new to statistical significance testin. I understand each of the two groups of data must be of uniform distribution to carry out the t tests. So what happens if one group is uniform and the other isn't? Do I use non-parametric test or can I still use the t test?

Thank you

2.

3. Originally Posted by oludot5
Hi, I am pretty new to statistical significance testin. I understand each of the two groups of data must be of uniform distribution to carry out the t tests. So what happens if one group is uniform and the other isn't? Do I use non-parametric test or can I still use the t test?

Thank you

It is advisable to use the non-parametric variant of the Student t-test.

4. Hi Cognito,

THanks for your reply. In this case, where I m trying to carry out significance test between two groups with one having a normal distribution and the other not normal, are you saying I should use a non parametric test like Mann-Whitney test?

5. Originally Posted by oludot5
Hi Cognito,

THanks for your reply. In this case, where I m trying to carry out significance test between two groups with one having a normal distribution and the other not normal, are you saying I should use a non parametric test like Mann-Whitney test?

If your groups are unpaired, then you have to use a Mann-Whitney test (or a Wilcoxon rank-sum test).
I hope this helps.

6. Thanks Cognito.

My sample size is 19 and they are paired data. What is the best test to use in this case?

7. Originally Posted by oludot5
Thanks Cognito.

My sample size is 19 and they are paired data. What is the best test to use in this case?

A Wilcoxon signed rank-sum test (not the Mann-Whitney test, because that is the non-parametric variant of the paired Student t-test).

8. thanks a lot, appreciate

9. Originally Posted by oludot5
thanks a lot, appreciate

You are welcome.
If you have more questions, feel free to ask them.

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