Purpose: Childhood stuttering is common but is often outgrown. Children whose stuttering persists experience significant life impacts, calling for a better understanding of what factors may underlie eventual recovery. In previous research, language ability has been shown to differentiate children who stutter (CWS) from children who do not stutter,…

Using a panel data set of scientists in the US, we examine the hypothesis that workers in jobs poorly matched to their education are more likely to retire. In pooled estimates, we confirm that the mismatched are more likely to retire and that among retirees, the mismatched retire at younger ages. Hazard function estimates also support the…

The goal of this study is to determine the impact of Compressed Natural Gas (CNG) crisis on Student's Academic Life of Karachi Pakistan. This research helps in observing the behavior of students and their educational progress includes depression and anxiety, rate of absenteeism and undesirable results in exams threatens due to CNG crisis and…

In science and engineering courses, instructors administer multiple examinations as major assessments of students' learning. When a student is unable to take an exam, the instructor might estimate the missing exam score to calculate the student's course grade. Using exam score data from multiple offerings of two large courses at a public…

The purpose of this study is to determine if there is a relationship between oral narrative production and the reading comprehension of expository text. The research questions are: (1) What is the relationship between oral narrative production and reading comprehension of expository text in fifth-grade students?; (2) Which components of oral…

The intention of this study was to better understand how certain aspects in a college student's life (i.e., perceived stress, styles of coping, and social support) or how combinations of these variables may contribute to higher levels of alcohol consumption. The present study examined the relationship between perceived stress, functional coping…

This dissertation investigated how a certain type of organizational knowledge sharing, procedural knowledge transparency, affected innovation adoption rates of members of a corporate social network within a large Scandinavian organization, in its two years of activity. It also explored the mediation of these effects by different types of…

It is well known that students of inferential statistics find the hypothetical, probabilistic reasoning used in hypothesis tests difficult to understand. Consequently, they will also have difficulties in understanding "p"-values. It is not unusual for these students to hold misconceptions about "p"-values that are difficult to…

The demand for graduates with Science Technology Engineering and Mathematics (STEM) degrees continues to rapidly increase. By 2018, the majority of positions that require a minimum of a bachelor degree will necessitate considerable mathematics and/or science training. In order for students to access, persist, and complete STEM majors, they must…

In this paper, we investigate two purported problems with Bayesian Knowledge Tracing (BKT), a popular statistical model of student learning: "identifiability" and "semantic model degeneracy." In 2007, Beck and Chang stated that BKT is susceptible to an "identifiability problem"--various models with different…

In standard item response theory (IRT) applications, the latent variable is typically assumed to be normally distributed. If the normality assumption is violated, the item parameter estimates can become biased. Summed score likelihood based statistics may be useful for testing latent variable distribution fit. We develop Satorra-Bentler type…

Empirical evidence exists that enhancing students' language can promote the mathematics learning of multilingual students at risk, whereas other target groups (e.g., monolingual students, successful students, both with diverse academic language proficiency) have hardly been considered. This cluster-randomized controlled trial (N = 589)…

Research shows that teachers influence students' attitudes towards; performance in; and perceptions of a subject. Hence, the need to improve the teaching and learning of many curricular subjects has been well documented for many years. This paper focusses on efforts made to develop competence among out-of-field teachers of mathematics and…

In our data-rich world, there are strong calls for greater focus on data literacy as increasingly, 21st century jobs require some level of data literacy. Data literacy is inherently STEM integration, especially when working with real-world scenarios, as it requires bringing math and technology into the science classroom to interpret and engage…

Considerable past classroom learning environment research has focused on the primary and secondary levels of education and the subject areas of science and mathematics. The current study is distinctive in its focus on university business statistics learning environments. For the first time, we validated and applied the widely-used What Is…