I am trying to do a one way ANOVA and having some difficulty proceeding it. Among all the assumptions, I am stuck with these two: normality and equal variance. My questions are,
My independent variable has 4 categories. The normality assumption is satisfied for two of the 4 categories. I read that ANOVA is quite robust so a small violation of normality is not a big deal. How can I decide that the violation is acceptable?
If homogeneity of variances is violated, it is suggested to do a Welch's F test. I assume I can only do that if the normality assumption is satisfied. Is that correct?
Looking forward to any suggestions! .