Gathering data: does it make sense?

Abstract

Much laboratory work in school science involves observation and measurement; an important development, in recent years, has been the application of computers to this activity. Data-logging techniques have been available to science teachers for some time (outside the United Kingdom [UK], this technology is sometimes known as microcomputer-based laboratories or MBL). It is only relatively recently, however, that data-logging technology has become sufficiently user-friendly and affordable for it to be more widely adopted. The use of sensors, interfaces and data-loggers to capture and record data, and its subsequent display and analysis using computer software, now constitute a realistic alternative to traditional approaches. With the National Curriculum for initial teacher training including information and communications technology now in place in the UK, the time seems opportune to take stock of current use of data-logging methods and to consider how they might be further developed. This article describes how data-logging currently appears to be used in science lessons. It considers how the demands of the National Curriculum have shaped current practice, and argues for a shift of emphasis in the pupils' role in data-logging activities. Some suggestions are then offered for encouraging pupils to engage in more interpretative activity, which recent software readily supports.     

A Comparison of Tests for Equality of Two or More Independent Alpha Coefficients

This article extends the Bonett (2003a) approach to testing the equality of alpha coefficients from two independent samples to the case of m ≥ 2 independent samples. The extended Fisher-Bonett test and its competitor, the Hakstian-Whalen (1976) test, are illustrated with numerical examples of both hypothesis testing and power calculation. Computer simulations are used to compare the performance of the two tests and the Feldt (1969) test (for m = 2) in terms of power and Type I error control. It is shown that the Fisher-Bonett test is just as effective as its competitors in controlling Type I error, is comparable to them in power, and is equally robust against heterogeneity of error variance.     

Effects of microcomputer-administered diagnostic testing on immediate and continuing science achievement and attitudes

This investigation had three purposes: (1) to document any immediate and continuing benefits associated with the use of microcomputer-administered testing; (2) to determine what type of student might benefit most from microcomputer-administered diagnostic testing; and (3) to document the feasibility of microcomputer-administered diagnostic testing. The subjects of the study were enrolled in a biology course based on the BSCS Blue text. A random half of the students received behaviorally-stated performance objectives, while the remaining half received behaviorally-stated performance objectives in conjunction with microcomputer-administered diagnostic testing. The results of this study indicate that microcomputer-administered diagnostic testing can positively influence the immediate, but not the continuing, achievement of students in science. In addition, neither student aptitude nor achievement motivation level were found to interact with treatment or influence achievement. Affective data indicate that students react favorably to the use of objectives, computers, and diagnostic testing. Cost summary data reveal that when the expense of administering diagnostic testing by microcomputer is prorated over a five-year period, the cost of a diagnostic test is reduced to approximately three cents.     

Effects of Proximity on the Choice to Be Physically Active or Sedentary

The link between physical activity and weight loss has precipitated interest in interventions to foster adherence to exercise. It has been suggested that treatment effects, when significant, should be analyzed to determine theory-based mediators. This research assessed possible mediation of changes in Physical Self-Concept, Exercise Self-Efficacy, Total Mood Disturbance, and Body Areas Satisfaction scores on the relationship between exercise session attendance and participation by obese women in a 6-month treatment based on tenets of social cognitive theory (n = 73) or a control condition (n = 64). Participation in the treatment was associated with significantly greater exercise session attendance and significantly greater improvements in Physical Self-Concept, Exercise Barriers Self-Efficacy, and Body Areas Satisfaction. Overall, changes in the assessed psychological factors demonstrated significant mediation of the association between group membership and exercise session attendance, R² = .23, with only change in Physical Self-Concept scores providing a significant unique contribution. Extensions of this research across different sample types, and with longer durations, were suggested to refine theory and, ultimately, improve exercise adherence treatments.