Groupwise or whole population Normality testing in ANOVA, which is better?

Temidayo Olutoyin Olurishe @Temidayo_Olurishe

07 July 2018 0 900 Report

With several groups to test for differences in mean, is it best or statistically correct to do Shapiro Wilk test group wise or for the entire data that is from all groups collectively?

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Science method

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