This paper includes a nontechnical description of methods for calculating effect sizes in intellectual and developmental disability studies. Different hypothetical studies are used to illustrate how null hypothesis significance testing (NHST) and effect size findings can result in quite different outcomes and therefore conflicting results. Whereas…

The purpose of this study was to investigate the effectiveness of computer-aided instruction as compared with the traditional lecture method of cognitive learning of new curriculum materials. It was hypothesized that students instructed by the computer-aided instruction method would gain higher knowledge of the subject matter in terms of cognitive…

A competency-based evaluation (skills test, minimum competence standard, attitude survey) conducted to measure effectiveness of large scale basic library skills workbook program showed that workbook instruction made statistically significant improvement in test scores, but failed to raise more than 53% of students to a minimum-competence level.…

Describes a study in which 46 high socioeconomic status elementary and secondary children were exposed to Logo and Bank Street Writer at a computer camp. After exposure, children 12 and under minimally shifted toward an internal locus of control as measured by the Nowicki-Strickland Locus of Control Scale for Children. (Author/MBR)

The Penn Manor CRT/Curriculum Articulation Project was designed to study the impact of the implementation of four specific interventions on the achievement of elementary school students in mathematics and language arts. The interventions were as follows: (1) classroom teachers were given individual curriculum skill objectives for their grade…