# What test should I use if:

I'm trying not to have a seizure among the bunch of numbers and data I have. My experiment data consists of three non-equal, non-parametric groups, and I need to compare those groups to state if there exists statistical difference between those groups. Which will be the best test I can use to achieve so? Group 1 data: n=12, mean=0.886, SD=0.74 | Group 2 data: n=16, mean= 0.554, SD= 0.39 | Group 3 data: n=13, mean= 0.79, SD= 0.68

• Do you have all your data, or just the summaries you listed here? – Matt Brems Jan 30 '16 at 23:01
• I have all of my data if you need it – Joe V. Jan 30 '16 at 23:17
• I don't need the data; I was just making sure that you had it available and weren't solely relying on the summary statistics for your analysis. – Matt Brems Jan 30 '16 at 23:18
• Could you explain what a "non-parametric group" is and what you mean by a "statistical difference"? – whuber Jan 30 '16 at 23:19
• Whuber: the data among my groups are non-parametric. What I mean by statistical difference, is (the goal of my statistic work) to evaluate if there is a statistical significance among the group means. – Joe V. Jan 30 '16 at 23:23