This comparative study was designed to investigate how online and traditional face-to-face (FtF) students used different learning styles in a graduate educational course. A nonequivalent control group design was employed. The study involved 19 students in an experimental group (online section) and 25 students in a control group (FtF section) in a…

This article reports on a research effort that investigated whether the use of Microcomputer-Based Labs (MBLs), implemented within an inquiry-based activity sequence on phase transformations (melting and freezing), contributes to the development of fourth grade (9-10 year-old) students' conceptual understanding and ability to construct and…

Selectivity bias arises in program evaluation when the treatment or control status of the subjects is related to unmeasured characteristics that themselves are related to the program outcome under study. This situation has the potential to lead to an incorrect estimation of the treatment effect when assignment to treatment and control groups is…

Seventy-seven of 100 universities from the United States, Canada, and the United Kingdom were surveyed with regard to educational, methodological, and ethical practices in using introductory psychology subject pools. Survey items were based on dimensions employed by Jung and on newly salient goals of the subject pool as suggested earlier by…

THIS STUDY ASSESSES THE EFFECTS OF ORTHOKINETIC SEGMENTS UPON THE MOTOR RESPONSES OF NORMAL MALE COLLEGE STUDENTS PERFORMING THE VERTICAL JUMP AND THE STANDING BROAD JUMP. THE VARIOUS PLACINGS OF THE ELASTIC AND INELASTIC FIELDS OF THE SEGMENTS UPON THE AGONIST AND ANTAGONIST THIGH MUSCLES OF STUDENTS WERE NOTED AND COMPARED WITH PERFORMANCE…

THIS STUDY WAS AN EXPERIMENTAL INVESTIGATION OF THE EFFECTS OF AN ENRICHMENT PROGRAM ON A SELECTED GROUP OF FIRST GRADERS. ITS PURPOSE WAS TO DETERMINE WHETHER CHILDREN EXPERIENCING THE EXPERIMENTAL CONDITIONS SHOWED GREATER GROWTH IN INTELLIGENCE AND ACHIEVEMENT AND GREATER USE OF FUNCTIONAL LANGUAGE THAN A CONTROL GROUP AT THE END OF ONE SCHOOL…

The data reported here were gathered in three ethnographic studies in different research settings: a single school, school district, and research center/school district team. These longitudinal studies incorporated the use of ethnography for purposes of collecting data about classroom teachers, principals, staff developers, central office…

One method for teaching young people how to interpret literature was defined, and the effects of that method on the responses of ninth grade students to selected short stories were measured. Four English teachers and their 94 students were randomly assigned to two experimental and two control classes. Eight short stories were read during three and…

Research literature regarding the aptitude treatment interaction (ATI) model of research is reviewed, and arguments for and against the use of the model are described. The purpose of the model is to allow a combination of desired properties of experimental and correlational methods. It yields disordinal interactions when experimental situations…

The Dunnett procedure for comparing several treatment means with a control is applied to the problem of comparing several treatment variances with the variance of a control. Appropriate critical values are specified and an example is provided. (Author)

A specific form of nonrandom assignment to treatment groups, the "alternate ranks" design, was investigated. This design eliminates the possibility of a correlation between the covariate and the treatment, and rules out experimenter bias in assignment of subjects to groups. (Editor)

Modeling the process by which participants are selected into groups, rather than adjusting for preexisting group differences, provides the basis for several new approaches to the analysis of data from nonrandomized studies. Econometric approaches, the propensity scores approach, and the relative assignment variable approach to the modeling of…

Explains the characteristics and importance of random assignment in experimental research on education. Considers factors supporting causal inferences, the nature of "assignment units," differences between random sampling and random assignment, the characteristics of randomization tests, forms of random assignment, and effects of experimental…

The use of large-N group comparison research methods based on a nomothetic model is compared with idiographic methods employing single-system designs and intensive study of the individual. Limitations of the nomothetic model and advantages of the idiographic approach are presented. (SK)