A meta-analysis of 105 studies reporting 152 self-concept interventions in school settings was conducted. The aims of the study were twofold: to explore the construct validity approach to self-concept interventions, and to examine aspects of the administration of the interventions, namely treatment setting, administrator type, administrator…

Seance-room and other large-scale psychokinetic phenomena have fascinated humankind for decades. Experimental research has reduced these phenomena to attempts to influence (a) the fall of dice and, later, (b) the output of random number generators (RNGs). The meta-analysis combined 380 studies that assessed whether RNG output correlated with human…

Meta-analysis was used to synthesize findings from comparative studies of depression in mothers of children with and without developmental disabilities. Effect sizes were determined for 18 studies conducted between 1984 and 2003. A weighted effect size of 0.39 indicated an elevated level of depression in mothers of children with developmental…

Three major methods of survey research, face-to-face interviews, telephone interviews, and mail questionnaires, are compared with respect to the quality of the data. The literature on experimental comparisons of these methods is reviewed, and the effects of the mode of data collection on aspects of data quality are examined. The effects of the…

This study provides recommendations for the measurement of organizational climate based on relationships between organizational climate and job performance and satisfaction. A search of climate studies was conducted in the business and psychology literatures, and meta-analyses of correlations with performance and satisfaction were performed (16…

An important issue in educational and employment settings is the degree to which evidence of validity obtained in one situation can be generalized to another situation without further study of validity in the new situation. Theory, procedures, and applications concerning validity generalization are addressed. Meta-analytic techniques make possible…

Using meta-analytic techniques, 54 studies were analyzed for differences in competencies of technically and professionally educated nurses. The research examined (1) the difference in three generic competencies (conceptual, human, functional) between nurses educated in technical versus professional programs, and (2) the relationship between the…

This article examines the current context, challenges, and issues for school leaders and their development in the United States. Current debates about who should lead, what capacities they should have, and how they are best prepared to lead are reviewed. Using several recent studies of the principalship and learning-centered leadership, the author…

The literature describing deaf persons' intelligence was subjected to a quantitative and qualitative review in this analysis of 85 studies containing independent samples of 43,177 deaf subjects. First, bibliometric analyses were conducted to define the scope, dissemination, and trajectory of the research investigating deafness and Intelligence…

Concern over the validity of statistical tests performed on data that may not satisfy underlying assumptions has prompted methodological researchers to perform Monte Carlo studies for frequently used tests. Unfortunately, these studies appear to have had little impact on methodological practice. One reason is the lack of an overarching framework…

Study effect meta-analysis was used to synthesize the results of explicit instruction on critical thinking (CT). The approach involved the collection of 250 studies (books, articles, dissertations, and abstracts) from the ERIC database and "Dissertation Abstracts International", coding of the study features, calculation of effect sizes,…

Since about 1962, researchers have explored the effectiveness of educational software in the schools under various conditions, and many have concluded that computer assisted instruction (CAI) is effective. Many of the studies reviewed to support this conclusion, however, had design flaws. Reviews of educational software effectiveness studies have…

Differences in science achievement between males and females have been examined either directly or indirectly in a variety of studies. This investigation reviewed a quantitative synthesis of correlational research on science affect, ability, and achievement conducted by Steinkamp and Maehr. Their findings were reassessed by employing a…

A synthesis of findings from 38 studies on group-based applications of mastery learning strategies are presented. Meta-analytic procedures were used to combine the results of the studies and to calculate overall estimates of the effects of group-based applications. Results show that such applications yield consistently positive effects on both…

The meta-analytic approach used in this review is similar to that described by Glass et al. (1981), whose approach requires a reviewer to locate and code studies of an issue, to code study outcomes on a common scale, and to use statistical methods to relate study features to outcomes. The studies considered for use in this meta-analysis came from…