A subtraction experiment with six and seven year old children

This paper gives an account of an experiment involving 176 children of 6 and 7 years and their difficulties with subtraction problems. By using two screening questions, four levels of attainment were established and two teaching programmes were then devised to help the children forward to their next level. The results show that it is possible to assess a level of understanding in subtraction quickly and accurately and that, through the teaching programmes, pre-requisite skills needed to establish a sound foundation for subtraction can be taught. The experiment indicates, however, that an attempt to symbolise too soon is a danger to be avoided.     

The effect of socioeconomic background on earnings: a comparison by race

Consistent with previous studies, we find that family background variables exert significant indirect effects on earnings of both white and black males. In the case of blacks, parental income in particular exerts a significant direct effect on earnings. Education is found to be a much more important determinant of black earnings than white earnings, while job tenure has the reverse relationship. After adjustments, parental income and level of education exert the strongest effects on reducing the black-white earnings differential.     

The keyword effect: A conceptual replication,effects on bias,and an optimization

Metacognition and Learning - Prompting learners to generate keywords after a delay is a promising means to enhance relative judgment accuracy in learning from texts. However, to date, conceptual...     

Development of the Biology Card Sorting Task to Measure Conceptual Expertise in Biology

There are widespread aspirations to focus undergraduate biology education on teaching students to think conceptually like biologists; however, there is a dearth of assessment tools designed to measure progress from novice to expert biological conceptual thinking. We present the development of a novel assessment tool, the Biology Card Sorting Task, designed to probe how individuals organize their conceptual knowledge of biology. While modeled on tasks from cognitive psychology, this task is unique in its design to test two hypothesized conceptual frameworks for the organization of biological knowledge: 1) a surface feature organization focused on organism type and 2) a deep feature organization focused on fundamental biological concepts. In this initial investigation of the Biology Card Sorting Task, each of six analytical measures showed statistically significant differences when used to compare the card sorting results of putative biological experts (biology faculty) and novices (non–biology major undergraduates). Consistently, biology faculty appeared to sort based on hypothesized deep features, while non–biology majors appeared to sort based on either surface features or nonhypothesized organizational frameworks. Results suggest that this novel task is robust in distinguishing populations of biology experts and biology novices and may be an adaptable tool for tracking emerging biology conceptual expertise.