An empirical study of statistical overkill investigated the generalizability of multiple regression equations as a function of the subject/variable ratio. Data from various-sized groups of rehabilitation clients were used to develop the equations. Findings showed that equations developed on samples with less than a 10 to 1 ratio failed to…

Procedures to be applicable in situations in which large numbers of individuals are tested or in situations where multiple measures are taken. (Author/CB)

This study compared two subgroups of trade and technical teachers to determine whether or not any biographical differences existed. (Author/GB)

The use of matched sampling in experimental and nonexperimental research ahs been frustrated by the problems of attrition and incomplete matching. The amount of attrition of sample size and incomplete matching are shown to be a function of various aspects of the research, including the level of measurement of the matching variables, the sampling…

A psychological theory of educational productivity is tested, and the usefulness of the National Assessment of Educational Progress data for secondary analyses for policy purposes is explored. Class as a social psychological factor and the didactic quality of instruction appear to be the only unequivocal and potentially manipulable causes of…

Presents a method for teaching sampling that uses hypothetical, small-scale target populations. Suggests that this method can best introduce the basic concepts of sampling in the context of a concrete example. Uses actual data collected from the class in order to provide a hands-on experience. Notes some potential limitations of the approach. (KO)

The equating methods and sampling designs used in the empirical studies in this special issue on the use of matched samples for test equating are described. Four requisites for equating are listed, and the invariance of equating functions requisite is identified as the focus of this issue. (SLD)

Two faculty in business and public and environmental affairs find that students need to move between personal-based experience, data, and a higher level of analytical reasoning. Their teaching of marketing and statistics is shown to benefit from the structured analysis and detailed assessments of the Decoding the Disciplines model.

For two random variables, X and Y, let D = X - Y, and let theta[subscript x], theta[subscript y], and theta[subscript d] be the corresponding medians. It is known that the Wilcoxon-Mann-Whitney test and its modern extensions do not test H[subscript o] : theta[subscript x] = theta[subscript y], but rather, they test H[subscript o] : theta[subscript…

Analysis of continuous variables sometimes proceeds by selecting individuals on the basis of extreme scores of a sample distribution and submitting only those extreme scores to further analysis. This sampling method is known as the extreme groups approach (EGA). EGA is often used to achieve greater statistical power in subsequent hypothesis tests.…

The foundation of an individual's optimum or less than optimum development is laid down during the early years of life, particularly during the age between birth and six years. This age covers pre-school education. This study was designed to investigate the effectiveness of Early Childhood Education programme in preparing Pre-school children in…

Empirical studies addressing admission to and graduation from a doctoral program focusing on educational leadership are noticeably absent within the professional literature, and this study seeks to fill partially this void through testing specific hypotheses. Archival data were used to conduct a three group discriminant analyses where the…