Ken Kostka's experiment re: excluder holes
Snyder  rank C____ rank
5 6 6 1.5
5 6 6 1.5
5 6 5 6
5 6 5 6
5 6 4 15.5
4 15.5 4 15.5
4 15.5 4 15.5
4 15.5 4 15.5
4 15.5 4 15.5
4 15.5 3 24
4 15.5 3 24
4 15.5 3 24
3 24 0 27.5
3 24 0 27.5
Total 59 186.5 51 219.5
Ave 4.21 3.64
Mann-Whitney test for difference
U =  114.5
U' = 81.5
critical value  = 144; n1 = 14, n2 = 14.  At P<0.05
Therefore, accept the hypothesis that the distributions of the two treatments are the same
 and no significant difference exists