Learning about statistics is a lot like learning about science: the learning is more meaningful if you can actively explore. This second installment of "Explorations in Statistics" delves into test statistics and P values, two concepts fundamental to the test of a scientific null hypothesis. The essence of a test statistic is that it compares what…

In this study, we investigate the logistic regression (LR), Mantel-Haenszel (MH), and Breslow-Day (BD) procedures for the simultaneous detection of both uniform and nonuniform differential item functioning (DIF). A simulation study was used to assess and compare the Type I error rate and power of a combined decision rule (CDR), which assesses DIF…

We wanted to test the hypothesis that neuropsychiatric disorder (NPD) with language impairment (LI) is a more severe variant of NPD than NPD without LI, and that this variant can be easily picked up by a non-word repetition (NWR) task. We therefore tested 56 (mean 7.6, range 6.1-9.5 years) children divided into three subgroups: one with LI only (n…

Null hypotheses are simple, precise, and theoretically important. Conventional statistical analysis cannot support them; Bayesian analysis can. The challenge in a Bayesian analysis is to formulate a suitably vague alternative, because the vaguer the alternative is (the more it spreads out the unit mass of prior probability), the more the null is…

Several criteria from the optimal design literature are examined for use with item selection in multidimensional adaptive testing. In particular, it is examined what criteria are appropriate for adaptive testing in which all abilities are intentional, some should be considered as a nuisance, or the interest is in the testing of a composite of the…

The self-concept is the sum of all your thoughts, feelings and belief about yourself. The self-concept may be positive or negative. This paper focuses on self-concepts of Secondary School Teachers and its relationship with their adjustment. The research was carried out in Aurangabad, Maharashtra on a sample of 50 teachers. Self-concept of teachers…

The study investigated the level of job satisfaction of male and female administrative staff in South West Nigeria Universities. The research design used was a descriptive survey type. The population consisted of all the senior administrative staff in the universities, out of which a sample of 400 respondents made up of 100 respondents from each…

This dissertation proposes a new factor-analytic technique for detecting cheating on exams. Person-fit statistics have been developed to assess the extent to which examinees' response patterns are consistent with expectation, with expectation defined in the context of some model. Response patterns that are inconsistent with expectation are said to…

With passage of The No Child Left Behind Act in 2001, the nation's schools have been under pressure to bring all students to a proficient level as defined by their state. The State of California currently uses a status model accountability system to measure whether a student, school, or district is proficient. Other states such as Arizona,…

This study explored how science teachers and school administrators perceive the use of the affective domain during science instruction situated within a high-stakes testing environment. Through a multimethodological inquiry using phenomenology and critical ethnography, the researcher conducted semi-structured interviews with six fifth-grade…

Recent research has demonstrated that Alzheimer's disease (AD) affects the visual sensory pathways, producing a variety of visual deficits, including the capacity to perceive structure-from-motion (SFM). Because the sensory areas of the adult brain are known to retain a large degree of plasticity, the present study was conducted to explore whether…

Introduction: Educational policy in the UK has moved towards inclusion (Lindsay, 2003), resulting in debate over the use of disability labels (Lauchlan & Boyle, 2007). Labelling influences social-identity (Olney & Brockelman, 2003), this paper suggests social-identity influences self-efficacy and, therefore, academic performance…

Just as postsecondary schooling serves as a dividing line between the advantaged and disadvantaged on outcomes like income and marital status, it also serves as a dividing line between the healthy and unhealthy. Why are the better educated healthier? Human capital theory posits that education makes one healthier via cognitive (skill improvements)…

Complex dynamic control (CDC) tasks are a type of problem-solving environment used for examining many cognitive activities (e.g., attention, control, decision making, hypothesis testing, implicit learning, memory, monitoring, planning, and problem solving). Because of their popularity, there have been many findings from diverse domains of research…

The curriculum is established. Lesson plans are in place. Repertoire has been chosen. A regular rehearsal and performance schedule is underway. Now it is time to start evaluating how much and how well students are learning. Time, in other words, for one of the most essential--and trickiest--parts of the music educator's job: assessment. According…