As evidence-based reform becomes increasingly important in educational policy, it is becoming essential to understand how research design might contribute to reported effect sizes in experiments evaluating educational programs. The purpose of this study was to examine how methodological features such as types of publication, sample sizes, and…

Research in fields other than education has found that studies with small sample sizes tend to have larger effect sizes than those with large samples. This article examines the relationship between sample size and effect size in education. It analyzes data from 185 studies of elementary and secondary mathematics programs that met the standards of…

In recent years, there has been a revival of interest in financial incentives to encourage students to attend school and to improve their academic achievement, graduation rates, and other outcomes. Conditional cash transfers programmes in developing countries, especially PROGRESA in Mexico, have found positive effects on attendance in large-scale…

A descriptive analysis of research practices and a meta-analysis of control group effect sizes are used to address Hawthorne effects in educational experiments. The analysis of 86 studies and 256 treatment/Hawthorne/no-treatment control group effect size comparisons indicate that artifact controls have limited utility in dealing with the Hawthorne…

Project objectives included (1) establishing a body of knowledge concerning the role of the Hawthorne effect in experimental designs in educational research, (2) assessing the influence of the Hawthorne effect on educational experiments conducted under varying conditions of control, (3) identifying the major components comprising the effect, and…

The purpose of this paper is to summarize and evaluate experiments which examined the effects of teacher questions on student achievement. The studies reviewed are of two types: (a) training experiments, in which the independent variable is teacher training; and (b) skills experiments, in which the frequency and manner of use of a teaching skill…

In the last several years, one of the approaches that has been advocated as a mechanism to bring about needed improvements and revitalize education is the use of incentives. This paper suggests a conceptual framework for studying the uses of incentives in American public education and examines briefly the state-of-the-art of recent research and…

The purpose of this study is to assess the effectiveness of the experimental bilingual education programs in Bridgeport, Hartford, New Britain, and New London, Connecticut, during the first year of operation (1970-71) with respect to selected pupil and parent reactions. Specifically, the evaluation seeks to compare the experimental bilingual…

The purpose of this study is to examine the English-language performance of bilingual children so that patterns of difficulty may be ascertained and intelligent decisions can be made in designing language training for these students. The document first provides a review of relevant literature defining bilingualism, inherent characteristics of…

The purpose of this study was to improve the English competence of Spanish-speaking students, to increase their success in school, and to help them develop stronger self-concepts. Control and experimental groups of students were selected from kindergarten, second, and fourth grades of elementary schools with a predominantly Chicano population.…

THIS REVIEW OF THE LITERATURE ENDEAVORS TO COVER ALL THE EXPERIMENTAL AND "SEMI-EXPERIMENTAL" RESEARCH ON THE EFFECTIVENESS OF EDUCATIONAL TELEVISION. TOPICS REPRESENTED ARE--(1) THE TEACHING ABILITY OF TELEVISION, (2) TELEVISION VERSUS CONVENTIONAL TEACHING, (3) TELEVISION VERSUS OTHER MEDIA, (4) PROGRAM PRODUCTION AND FORMAT, (5)…