ResultsCalculated from: Mann_Whitney_U_Test.csv using R.P-value:
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-2.11Group A mean rank:
7.80Group B mean rank:
13.20Written as a sentenceThere was a significant difference between Group A and Group B; U = 23.00, p < 0.05. The mean rank of Group A was 7.80 and the mean rank of Group B was 13.20.Test assumptionsYour data must have these characteristics for this test to be valid.
1) The values are ordinal.
2) All values are mutually independent.
Interpreting results: recommended readingsNeed a refresher? Start here!
1) Warning Signs in Experimental Design and Interpretation
2) Type I and Type II Errors