0.04866, which is the largest value 50.050.
As can also be seen from Table 1, the tabulated
POE rank sum of 66, however, is not associated
with a cumulative probability of 0.95134, which is
the smallest value ]0.950, but with the larger
probability of 0.96358. It should be noted that
this is not due to a lack of agreement between the
two methods. This follows from the fact that
Prob{Ri]66}1Prob{RiB66}1Prob
{Ri565}. The probability of Ri565 is read from
Table 1 as 0.95134, so that Prob{Ri]66}1
0.951340.04866. Therefore, the probability that
the rank sum is 66 or higher equals the probability
that the rank sum is 39 or lower. Its value of
0.04866 is the largest probability 50.050, which
also illustrates the symmetry of the nonparametric
probability distribution. The same conclusion can
be obtained by applying Eq. (9).