The purpose of the Neyman-Johnson statistical technique is to determine a region or span of values on r independent variables where the predicted criterion scores of two or more treatment groups are significantly different. Consequently, the technique should prove especially useful in research concerned with moderator variables or with the…

Three procedures are examined that educational researchers can use to analyze quantitatively the extent to which modifications of specific teacher behaviors lead to changes in student achievement. The task requires decent descriptions of the behaviors, appropriate statistical tools and measures of student outcomes that are worth while examining.…

Research investigated: 1) the effect of instructional mode on student achievement; 2) the relationship between a) the student factors of aptitude, sex, previous achievement, educational level, and academic major and b) achievement; and 3) the possibility of a homogeneity of regression equations for achievement of students in varying instructional…

This research report is a review and analysis of all of the published studies during the past 25+ years (since 1974) in the area of differential validity/prediction and college admission testing. More specifically, this report includes 49 separate studies of differences in validity and/or prediction for different racial/ethnic groups and/or for…