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I got z = 0, and therefore p = 1.0 in a Mann-Whitney U test. Considering this is impossible, should I instead report z = 0.0001 and p = 0.99?

Also, I have a different number of participants in my two conditions, I ran a parametric independent samples t-test, does anyone know if SPSS (the program I used) corrects for this?

Thanks in advance.

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# Mann-Whitney p = 1.0!

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