The implications of data from a review of ten years of the American Educational Research Journal (AERJ) indicating that random sampling is rare and that there is increased use of quasi-experimental designs lacking in random assignment are considered. It is suggested that tests of significance could be abandoned or at least placed in a subsidiary…

This paper focuses on two methods of performing multiple comparisons (post hoc or unplanned versus a priori or planned) for determining exactly where statistically significant results arise when there are more than "k equals two" groups. Textbook views and recommendations regarding the use of these two types of multiple comparisons are…