Mann-Whitney U-Test

Results
Calculated from: Mann_Whitney_U_Test.csv using R.
P-value: 0.0384
U-value: 23.00
Z-value: -2.11
Group A mean rank: 7.80
Group B mean rank: 13.20

Written as a sentence
There 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 assumptions
Your 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 readings
Need a refresher? Start here!
1) Warning Signs in Experimental Design and Interpretation
2) Type I and Type II Errors






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