I have an experiment like this: control group (n=3), treatment group 1(n=3), and treatment group 2 (n=3). I have one readout for all 3 groups: plasma IL-6 level. do I have to do a normality test such as Shapiro-Wilk test for each group before we perform one-way ANOVA test? In fact, the minimal sample number per group for running Shapiro-Wilk test is 6. so, that means I have to do nonparametric ANOVA test instead? what about post hoc Turkey test? do we need to run this Turkey test after we pass a normality test for each group?

I'm really confused on this and looking forward to your help. Thanks,

Li,

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