This study involving 352 students was designed to verify empirically the a priori use of multiple matrix sampling procedures in an elementary school using a nationally normed, commercizlly published achievement test. The study focused on effect of changes in item context, effect of previous exposure to items, and relative effectiveness of multiple…

The accuracy of estimating test means for groups of twelfth-grade students by the item-sampling technique was examined. The subjects were from 35 twelfth-grade schools participating in the National Longitudinal Study of Mathematical Abilities. Half of the students in each school were assigned to a treatment condition where they took a complete…

The relationship between types of students and the times students preregistered for the fall semester was investigated. The relationship between ACT scores, sex, approximate high school class size, first semester GPA, and time of registration/orientation at the University of North Dakota was explored. (MLW)

This study investigates the impact of cooperative learning and the impact of opportunity to interact with classmates on achievement and cross-handicap relationships. Results indicate that positive goal interdependence with collaborative-skills and academic group contingencies promoted positive relationships with nonhandicapped classmates, frequent…

The statistical properties of two methods of estimating gain scores for groups in quasi-experiments are compared: (1) gains in scores standardized separately for each group; and (2) analysis of covariance with estimated true pretest scores. The fan spread hypothesis is assumed for groups but not necessarily assumed for members of the groups.…

The utility of the biomedical model of adjusted statistics is demonstrated. The model is recommended for use by educational researchers to randomize subjects for a more accurate estimate of school programs' success or failure when compared across classrooms or other units. (Author/MH)