1.Here we are using data from our previously example where group 2 tended to have higher values than group 1, but group 1 had one extreme value.

2.Note that we have ordered and ranked each value for the 2 groups, and then summed the ranks for the 2 groups denoted as R1 and R2.

3.As seen, group 2 has a much greater sum with R2=145 compared to group 1 where R1=65.