I've done some measurement of tissue rigidity. So I did 1.000 measures with healthy (n=300) and ill (n=700) people.
Now I want to find out if there is a significant different value of the measured tissue rigidity for the ill people compared to the healthy people. Otherwise this measure method would give no benefit.
My data has no normality, so I choose a Mann Whitney U-Test.
But also my data is inhomogene (levene and also complete different histograms). So if I do the Mann Whitney I do get a p = .000
So I am not quite sure...
- how to interpret the inhomogene data
- if I can still use the MW U-Test (is it really significant)
- if there is another way to test if there is a significant difference between those two groups. Looking at my data shows me that there is obviously a difference between the values (as they are much more higher), but I need to test it statistically correct...