When conducting a Mann-Whitney U-test, if your calculated U-value is smaller than that of the critical value, than the test is considered statistically significant.

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A smaller U-value indicates a greater difference between the two groups being compared, and therefore a greater likelihood of rejecting the null hypothesis. If the calculated U-value is smaller than the critical value, this indicates that the difference between the two groups is statistically significant.

When Conducting a Mann-Whitney U-Test, If Your Calculated U-Value Is