This article presents findings of a study conducted to determine instructors’ perceptions of optimal class sizes for online courses with different levels of interaction. Implications for research and practice are also presented. A Web-based survey method was employed. Online courses studied were those taught sometime in the last 5 years by a single instructor in undergraduate or graduate progra...

Thus far researchers have focused on computing average differences in student achievement between smaller and larger classes. In this study, the author focus on the distribution of the small class effects at the school level and compute the inconsistency of the small class effects across schools. The author use data from Project STAR to estimate small class effects for each school on mathematic...

Genetic analyses of sensation seeking have shown fairly high heritabilities for measures of this trait. However, 40 to 60% of the variance remains unexplained by genetic factors. This longitudinal study examines the influence of characteristics of the family environment -birth order, family size, socio-economic status and parenting styles -on two dimensions of sensation seeking: disinhibition a...

Numerous front-of-package (FOP) nutrition labeling systems exist, but it is unclear if such labels influence behavior. A single-summary label called Smart Choices (SC) appeared briefly on products in the United States in 2009. The current study aimed to evaluate (1) the influence the SC symbol has on the serving and consumption of cereal; and (2) the impact of providing calorie and serving size...

Biological factors, such as abundance and body size, may contribute directly to extinction risk and indirectly through their influence on other biological characteristics, such as geographic range size. Paleontological data can be used to explicitly test many of these hypothesized relationships, and general patterns revealed through analysis of the fossil record can help refine predictive model...

The fossil record is the only source of information on the long-term dynamics of species assemblages. Here we assess the degree of ecological stability of the epifaunal pterioid bivalve assemblage (EPBA), which is part of the Middle Devonian Hamilton fauna of New York--the type example of the pattern of coordinated stasis, in which long intervals of faunal persistence are terminated by turnover...

Objective: Trauma is a disease of modern societies and one of the reasons for the deaths of all ages in those societies. It is estimated that each year about 8.5 million people worldwide lose their lives as a result of trauma. Among the types of injuri...