Tables for selecting sample size in correlation studies are presented. Some of the tables allow selection of sample size so that r (or r[squared], depending on the statistic the researcher plans to interpret) will be within a target interval around the population parameter with probability 0.95. The intervals are [plus or minus] 0.05, [plus or…

A core assumption of the standard multiple regression model is independence of residuals, the violation of which results in biased standard errors and test statistics. The structural equation model (SEM) generalizes the regression model in several key ways, but the SEM also assumes independence of residuals. The multilevel model (MLM) was…

Performances on tasks of phonemic manipulation, working memory, rapid naming, multisyllable word naming, receptive vocabulary and nonverbal intelligence were compared with decoding and spelling scores for 75 beginning readers. Multiple regression analysis revealed that phonemic manipulation accounted for the greatest amount of variance for both…

Objective: To investigate the risk factors for osteoporosis among a sample of middle-aged women. Methods: Adipose tissue and bone mineral density levels at the left femur, lumbar spine, and total body were assessed using dual-energy x-ray absorptiometry (DXA). Subjects (n=342) were surveyed regarding a variety of osteoporosis-related risk factors.…

The purpose of this study was to determine if a market ratio factor was a better predictor of faculty salaries than the use of k-1 dummy variables representing the various disciplines. This study used two multiple regression analyses to develop an explanatory model to determine which model might best explain faculty salaries. A total of 20 out of…

This study applies multilevel logistic regression to Demographic and Health Survey data from 22 sub-Saharan African countries to examine whether the relationship between child mortality and family structure, with a specific emphasis on polygyny, varies cross-nationally and over time. Hypotheses were developed on the basis of competing theories on…

This study investigated how Intelligence Quotient predicts general level of creativity and different components of creativity; fluency, originality, flexibility and creativity motivation among secondary school students in Oyo State. A total of four hundred and sixty (460) students were randomly selected from twenty (20) secondary schools in the…

Purpose: This study aims to explore the reasons why women are leaving the workplace. Are they opting out of the workforce to stay at home with their children as current media reports suggest, or are the reasons more complex as the Kaleidoscope Career Model (KCM) suggests? A second objective is to examine whether or not women's primary career…

Appraisals about the implications of stressful events that are evaluated as involving a threat to self (negative self-evaluation, negative evaluation from others, rejection by others) have been shown to place youth at risk for the development of mental health problems. This longitudinal study tested a protective-stabilizing interactive model, in…

Background: It is commonly assumed that there is conceptual equivalence between the task and ego achievement goals proposed by Nicholl's (1989) dichotomous achievement goal theory (Nicholls, 1989), and the mastery and performance approach goals advanced by Elliot's (1997) trichotomous hierarchical model of approach and avoidance achievement…

Researchers are being asked to conduct more complex analyses to add clarity and confidence in decision-making. This is especially true for researchers in the community college systems as they serve a more non-traditional student and are more likely to also serve at-risk populations. In this article we distinguish between moderators and mediators…

This paper is the second of two articles arising from a study of the association between pupil mobility and attainment in national tests and examinations in an inner London borough. Our first article examined the association of pupil mobility with attainment and progress during primary school. It concluded that pupil mobility had little impact on…

This study of deaf college students examined specific relationships between their mathematics performance and their assessed skills in reading, language, and English morphology. Simple regression analyses showed that deaf college students' language proficiency scores, reading grade level, and morphological knowledge regarding word segmentation and…

The researcher examined the effects of online (OL) and face-to-face (FTF) course modality choice, as a motivational component, on students. self-selection of courses. A naturally occurring control and treatment group comparison design was employed. The participants were 435 college students (200 OL and 235 FTF) who attended an accredited private…

Burnout and decreased levels of self-efficacy are contributors to the high attrition rate and increasing demand for highly-qualified special educators nationwide. This has led to a national shortage of special educators, which is a critical reason why current special educators are encountering high stress levels, dissatisfaction, and overall…