159
n ( n + 1) + n (n +1)
1 1 c c
4
could be used to calculate the
necessary cutoffs.
Since the Wilcoxon signed rank distribution is
discrete, exact .01, .025, .05 and .10 level critical values
do not always exist. These tables list the following:
1) The critical value (c) for a specific a level,
such that P(Tn n >c}c} = p-value).
nlnc
3) The attained significance level of the next
closest critical value is given in the square
brackets (i.e., P { T >(c1)}).
nl nc
For example, let n^= 10 and n£= 5, the critical value
for a .05 level test would be 53. The attained signficance
level for the test would actually be .048. The next closest
critical value would be 53-1 = 52, with an attained
signficance level of .059.
When n^ and nc are both very small, (generally less
than 3), many times a critical v^lue does not exist for a
specific level of significance. Then, the value in the