Mann Whitney U Test Critical Values Table. You can use the mann whitney test even when the group sizes are not equal. Critical values for the wilcoxon mann whitney test u.
You can use the mann whitney test even when the group sizes are not equal. If n 20 this table cannot be used. To determine the appropriate critical value we need sample sizes n 1 8 and n 2 7 and our two sided level of significance α 0 05.
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Using n 1 6 and n 2 6 with a significance level of 05 the mann whitney u table tells us that the critical value is 5. Use your value of to determine which table to use. In general for sample sizes larger than 20 the normal approximation is used and so you don t need to have values from the table of critical values. A p can be computed for u obt using the normal distribution approximation.
