This study was an attempt to replicate a previously reported quantitative trait loci association between general cognitive ability and a marker identified as EST00083 (P. Skuder et al., 1995). The association remained significant for 51 high and 51 average IQ child subjects but not for 40 extremely high and 50 average IQ subjects. Implications are…

Provides information regarding the National Educational Longitudinal Study database that was used for many of the studies in this volume. Provides relevant background and instructions so that others may use this resource from the National Center for Education Statistics. (Author/EV)

Investigates 10th grade students' ability to handle data and interpretation by using a variety of tasks. Discusses the importance of developing student discussion as a route to better conceptual understanding of data presented in graphical form. (Contains 15 references.) (Author/YDS)

The present article presents a tutorial on how to estimate and interpret various effect sizes. The 5th edition of the Publication Manual of the American Psychological Association (2001) described the failure to report effect sizes as a "defect" (p. 5), and 23 journals have published author guidelines requiring effect size reporting. Although…

Over the past 25 years, meta-analysis has assumed a significant role in the synthesis of counseling and psychotherapy research through the evaluation and interpretation of the results of multiple studies. An examination of four widely recognized rehabilitation counseling journals, however, reveals that only one meta-analysis (Bolton & Akridge,…

Surprising downshifts from more preferred (training incentive) to less preferred incentives (test incentive) are usually accompanied by emotional activation and suppression of conditioned behavior in rats. Two experiments were designed to determine whether consummatory behavior is similarly affected by downshifts of equal proportions. Within…

School improvement without will and moral purpose--without a genuine commitment to all students--is an empty exercise in compliance that, in the authors' experience, can do more harm than good. The authors have seen educators use data to "more accurately" track students, further widening the opportunity-to-learn gap. In response to achievement…

An analysis of survey data is used to examine the practices used to hire teachers, the level of principal autonomy within the process, the attributes sought in teachers, and to compare each based upon the characteristics of schools and of principals. Findings indicate that urban and low-performing schools (and the principals of these schools) are…

The comparability of examinations in different subjects has been a controversial topic for many years and a number of criticisms have been made of statistical approaches to estimating the "difficulties" of achieving particular grades in different subjects. This paper argues that if comparability is understood in terms of a linking…

In the United States, when English language learners (ELLs) are tested, they are usually tested in English and their limited English proficiency is a potential cause of construct-irrelevant variance. When such irrelevancies affect test scores, inaccurate interpretations of ELLs' knowledge, skills, and abilities may occur. In this article, we…

In this article, a practical demonstration suitable for any biology college classroom is presented. With the examples of a complex biological specimen (slug's radula) and a simple reference specimen (electron microscopical grid imprint in gelatin), both of which can be easily prepared, the capabilities of two imaging modes commonly used in optical…

Mathematics and statistics play important roles in peoples' lives today. A day hardly passes that they are not bombarded with many different kinds of statistics. As consumers they see statistical information as they surf the web, watch television, listen to their satellite radios, or even read the nutrition facts panel on a cereal box in the…

People often make interpretations when they believe they are providing factual descriptions. To demonstrate unintentional interpretation, the author showed a brief ambiguous video clip and asked students to write descriptions of what they saw and heard. When students evaluated their responses, they discovered that 96% of the class wrote…

A long-standing issue in the study of how people acquire visual information centers around the scheduling and deployment of attentional resources: Is the process serial, or is it parallel? A substantial empirical effort has been dedicated to resolving this issue. However, the results remain largely inconclusive because the methodologies that have…

This guide is designed to inform school directors about the value of a data dashboard and to provide information on how districts can create a data dashboard for school directors. A data dashboard is a tool for viewing and analyzing student achievement and performance data. Key data for monitoring student achievement and directing policy level…