While the benefits of the using the Learning Cycle have been well researched, one area that has received surprisingly little investigation is the effect that student cognizance of the learning cycle has on student performance in chemistry. The Learning Cycle, with its strong theoretical roots in scientific practice and learning theory, offers a…

The task-centered instructional strategy (Merrill, 2009) was designed specifically for the purpose of teaching complex problem-solving skills and emphasizes teaching in the context of a concrete real world task. Nevertheless, unlike other problem-centered instructional methods (e.g., constructivism) the task-centered instructional strategy is a…

Stress is damaging if it is continual, overwhelming. and prolonged. Law enforcement officers face stressful events daily. A relationship exists between stress levels and the physical and psychological effects to the human body. Although there is a general understanding of the damage stress can do physically and psychologically, many elements that…

Objective: The present study tested the hypothesis that improvements in parental sense of competence during multisystemic therapy (MST) lead to positive changes in parenting, which in turn lead to a decrease of adolescent externalizing problems. Mediational models were tested separately for 3 dimensions of parenting (positive discipline, inept…

During natural viewing, the trajectories of saccadic eye movements often deviate dramatically from a straight-line path between objects. In human studies, saccades have been shown to deviate toward or away from salient visual distractors depending on visual- and goal-related parameters, but the neurophysiological basis for this is not well…

The main objective of this study was to find out problems of people with visual impairment in rehabilitation centers in Nigeria. The sample consisted of 600 participants. A Questionnaire was used to collect data for this study. Two null hypotheses were formulated and tested at the 0.05 alpha-level of significance. Data were analyzed using t-test…

This article, written jointly by a mathematician and a barrister, looks at some of the statistical issues raised by court cases based on fraud involving chip and PIN cards. It provides examples and insights that statistics teachers should find helpful. (Contains 4 tables and 1 figure.)

The use of confidence intervals (CIs) as an addition or as an alternative to null hypothesis significance testing (NHST) has been promoted as a means to make researchers more aware of the uncertainty that is inherent in statistical inference. Little is known, however, about whether presenting results via CIs affects how readers judge the…

In two experiments we explored the instructional value of a cross-domain mapping between "number" and "line" in secondary school students' understanding of density. The first experiment investigated the hypothesis that density would be more accessible to students in a geometrical context (infinitely many points on a straight…

The aim of this study was to compare the small sample (N = 1, 3, 5, 10, 15) performance of a Bayesian multivariate vector autoregressive (BVAR-SEM) time series model relative to frequentist power and parameter estimation bias. A multivariate autoregressive model was developed based on correlated autoregressive time series vectors of varying…

This study examines a 118-year continuous record of retention and graduation rates at a public university for long-term trends not observable in shorter studies. While the first year retention rates stayed level over much of this period, second year rates increased steadily by 1.2% per decade. In contrast, graduation rates at 4 years compared to 6…

An in-class activity is described that can be used not only to motivate hypothesis testing, but also to understand and compute the p-value and power in a statistical test. (Contains 3 figures.)

Several methods for testing mediation hypotheses with 2-level nested data have been proposed by researchers using a multilevel modeling (MLM) paradigm. However, these MLM approaches do not accommodate mediation pathways with Level-2 outcomes and may produce conflated estimates of between- and within-level components of indirect effects. Moreover,…

We investigate which partner of a 2-gender couple moves out after separation. We test hypotheses on the impact of differences between the partners in the costs of moving out and resources, using data from the Divorce in the Netherlands survey (N = 1,537 ex-couples who separated between 1972 and 1998). Ex-partners initiating the separation were…

The level of self-employment varies significantly among immigrants from different countries of origin. The objective of this research is to examine the relationship between home-country national intelligence and self-employment rates among first generation immigrants in Norway. Empirical secondary data on self-employment among immigrants from 117…