Mann Whitney U Test Equation. Note that aside from the n 1 n 2 piece the rest of the definition of u 1 is actually in terms of n 2 and r 2 m and t in the paper. In every test u 1 u 2 is always equal to n 1 n 2.
For any mann whitney u test the theoretical range of u is from 0 complete separation between groups h 0 most likely false and h 1 most likely true to n 1 n 2 little evidence in support of h 1. Displaystyle y and both samples independent of each other. U 1 n 1 n 2 n 2 n 2 1 2 r 2.
Rank 1 is used for the lowest score rank 2 for the next lowest score and so on.
Is this evidence in support of the null or research hypothesis. Rank 1 is used for the lowest score rank 2 for the next lowest score and so on. So for example one might compare the speed at which two different groups of people can run 100 metres where one group has trained for six weeks and the other has not. Is this evidence in support of the null or research hypothesis.
