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The effect of changes in state revenue, property wealth, and enrollment from 1969–1970 to 1976–1977 on the equality of total educational revenue was investigated for nineteen states with available data. An exploratory two-stage methodology allowed a simulation of the effects of holding each of these factors at their 1969–1970 values and comparing the result with 1976–1977 predicted values. It was found that changes in state revenue were most equalizing, while changes in property wealth and enrollment were disequalizing. In addition, it was found that the change in the behavioral relationship between state revenue, property wealth, and enrollment, and local revenues from 1969–1970 to 1976–1977 was equalizing in twelve of the states and was larger than the change in the value of the most important of these factors (state revenue) in seven of the states. 相似文献
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Developing an understanding of the nature of food webs is an important topic in today's biology curricula. The relationships represented in a food web are rule-like in nature. Hence, it should be possible to construct a learning hierarchy for this concept. A hierarchy leading to the ability to determine how a change in the size of one population can affect another population in the same web but not on the same chain was hypothesized. Data from 200 subjects were extremely consistent with the hierarchy. A second major focus related to the identification of specific misconceptions held by subjects for food webs. The need to identify students' misconceptions of important concepts has been expressed widely in the recent science education literature. In the present article, an argument is presented for the usefulness of learning hierarchies in this work. Specific misconceptions and the frequencies of their occurrence are reported. 相似文献
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Alan Kimber 《Teaching Statistics》1991,13(2):34-37
This article discusses some aspects of a simple additive model for a time series and features the analysis of some recent data on mean monthly temperatures in England and Wales. 相似文献