Mann-Whitney U Test Calculator

Your details

Enter numbers separated by commas, spaces, or new lines. At least 2 values required.
Enter numbers for the second independent group. At least 2 values required.
The threshold probability below which the result is considered statistically significant.
Two-tailed tests for any difference. One-tailed tests for a directional hypothesis.
Applies a 0.5 correction to the numerator of z, improving accuracy when approximating a discrete distribution with a normal curve. Recommended for small samples.
U statisticStatistically significant
12

The smaller of U1 and U2 (used as the test statistic)

U1 (Group 1)53
U2 (Group 2)12
z-score2.102
p-value0.0356
Significant?Yes
Effect size (r)0.6406
Median (Group 1)16.5
Median (Group 2)10.5
Rank sum (Group 1)88.5
Rank sum (Group 2)47.5
n (Group 1)8
n (Group 2)8
2.102 z1.8% above · z-score

The difference between groups is statistically significant (p = 0.0356).

  • Group 1 (n=8) has a median of 16.50; Group 2 (n=8) has a median of 10.50.
  • U = 12, z = 2.1020, p = 0.0356.
  • The rank-biserial effect size is r = 0.6406, which is considered large by Cohen's conventions (0.1/0.3/0.5).

Next stepAt alpha = 0.05, reject the null hypothesis. Report U = 12, z = 2.10, p = 0.0356, r = 0.641 in your results section.

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