I'm working on research into the vitamin D levels of professional and amateur soccer players, and relationship with factors such as skin color, vitamin D-intake etc.
I don't know which test to use. I'll give you an idea of the situation:
- I have a continuous variable: the measured vitamin D levels
- A categorial variable: the skin color (either black or white )
I've read about the One-way ANOVA, but it requires three options for the categorical variable. I used the ANOVA test, the p-value was 0.005. Is it possible to use this test with just two options for the categorical variable? Or is there another test I could use?
And if it's possible to use the ANOVA, does the value F mean anything, or just the p-value?