“…It is further known, over decades of computer simulation studies (beginning with the seminal work of Norton's 1952 doctoral dissertation--see also Boneau, 1960;Lindquist, 1956;Petrinovich & Hardyck, 1969;and Cicchetti, 1994), that parametric techniques are quite robust with respect to violations of assumptions underlying their usage. Specifically, there are three parameters that need to be considered in the comparison of any two groups: sample sizes, or Ns; the ratio of the sizes of the two variances; and the shape of the distribution for each of the samples being compared.…”