No normality, no homocedasticity. U Mann-whitney no significant differences, t-test significant differences, which test should I trust?

Andrea Cecilia Serge @Andrea_Cecilia_Serge

11 November 2018 0 9K Report

I am trying to compare categorical (male-female) on a Likert variable (0-10). I checked normality and homocedasticity assumptions, which were not achieved. Thus, I choose U Mann-Whitney nonparametric test, rejecting Ha (there are no significant differences).

Nevertheles, it is supposed that t-test is potent enough to go on even if assumptions are not assumed, so I did it to compare, obtaining significant differences (same results conducting ANOVA 1-factor).

Which test should I trust?

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