Podcasting is being exploited incrementally by teachers as a tool for presenting educational content and encouraging language learning outside traditional classrooms. This paper reports on an investigation of three levels of podcast integration sustaining on the Iranian learner's lexical knowledge learning English as a Foreign Language (EFL). The…

Education research rarely lends itself to large scale experimental research and true randomization, leaving the researcher to quasi-experimental designs. The problem with quasi-experimental research is that underlying factors may impact group selection and lead to potentially biased results. One way to minimize the impact of non-randomization is…

The adequacy of mean length of utterance (MLU) as a criterion for matching retarded and normally developing children was investigated. Six normally developing and four retarded subjects were matched on MLU. Although matched on MLU, these two groups of children demonstrated both quantitative and qualitative differences in their use of language.…

A persistent problem in the evaluation of field-based projects is the lack of no-treatment comparison groups. Frequently, potential comparison groups are confounded by socioeconomic, racial, or other factors. Among the possible methods for dealing with this problem are various matching procedures, but they are cumbersome to use with multiple…

A meta-analysis was conducted on 44 educational studies that used either a (labelled) Hawthorne control group, a manipulation of Hawthorne effects, or a group designed to control for the Hawthorne effect. The sample included published journal articles, ERIC documents or unpublished papers, and dissertations. The studies were coded on 20 variables,…

This two-part study was done to investigate the effectiveness of the University of Chicago School Mathematics Project (UCSMP) Transition Mathematics Program implemented by Lexington School District (South Carolina) during the 1993-94 school year. Results on four mathematics subtests of the Stanford Achievement Test, 8th Edition are considered in…

To investigate the influence of handedness in the referral of elementary school students to a school psychologist, 120 left-handed referrals were matched with 120 right-handed referrals by sex, full-scale intelligence quotient, and chronological age. Comparison of the groups revealed that twins were more numerous among the left-handed students.…

In order to evaluate how individual characteristics of hospitalized children influence their acquisition of information presented in a film depicting preparation for surgery, 42 children between the ages of 4 to 17 were assigned to experimental and control groups that were matched for age, sex, race, type of surgery and previous hospital…

The purpose of this study was to compare the results of an analysis of covariance design to a method developed by the authors called within-class regression. Application of this statistical method can be to any quasiexperimental design with a large number of groups. A test of statistical significance to use with the within-class regression…

The presence of artifactual bias in analysis of covariance (ANCOVA) and in matching nonequivalent control group (NECG) designs was empirically investigated. The data set was obtained from a study of the effects of a television program on children from three day care centers in Mexico in which the subjects had been randomly selected within centers.…

Current testing standards call for test developers to provide evidence that testing procedures and test scores, and the inferences made based on the test scores, show evidence of validity and are comparable across subpopulations (American Educational Research Association [AERA], American Psychological Association [APA], & National Council on…

Background: Multiplication and division by fractions are among the most troublesome concepts in the elementary mathematics curriculum. Recent studies have shown that preservice elementary teachers in the United States do not have deep understandings of these concepts. Effective ways to improve preservice teachers' conceptual understanding of these…

Problems with conducting randomized field experiments in education are explored. Focus is on problems encountered while evaluating a group of dropout prevention projects. Project planners were asked to manipulate the subject eligibility criteria until they identified as eligible three to four times as many students as they could serve. They were…

Research in Bahrain has demonstrated that children in educationally-oriented day care centers made significantly greater gains in cognitive, social, and emotional measures than children in care-oriented centers or at home. This study provided further data and addressed the question of whether there are differences in the daily learning experiences…

The School of Education and Professional Studies at Central Connecticut State University was funded to improve student achievement through school-based reform and to enhance the preparation of teachers who work in urban schools. The vehicle for enacting these goals was the creation of professional development schools near the university. One…