Procedures based on the Student t statistic. The Dunn procedure (DN; Dunn,
1961) tests each pairwise difference using the Student t statistic (t) based on the
degrees of freedom in the error term of the ANOVA. Using a preselected family
wise alpha level (aFW), each test is conducted at a conservative pairwise alpha
level (apw), with apw established such that Xapw = aFW. For the Dunn procedure
applied to c comparisons, each test is conducted