Micceri (1989) examined the distributional characteristics of 440 large sample general education achievement and psychometric measures. All the distributions were found to be statistically significantly different from the normal distribution. In this study, 395 special education datasets were examined. Although there were some normally distributed datasets, most were not, and some were markedly different in shape from those found by Micceri (1989). Implications for statistical testing and making special education policy decisions were given.
Felder, Valerie and Sawilowsky, Shlomo S.
"Special Education Distributions and Analysis,"
Journal of Modern Applied Statistical Methods: Vol. 14
, Article 20.
Available at: http://digitalcommons.wayne.edu/jmasm/vol14/iss1/20