Parsimony and Model Evaluation

Marsh and Hau (1996) argued that certain models should not be penalized for having low parsimony because an appropriate model for the data may require estimating more parameters. Mulaik argues that Marsh and Hau misunderstand the concept of parsimony, particularly its role in testing a hypothesis about an incompletely specified model to establish its objective validity. More parsimonious models represent more complete hypotheses having more ways of being tested and possibly being disconfirmed. Mulaik also shows that even within the context of the models used in Marsh and Hau's examples, there are much more parsimonious versions of those models that could have been hypothesized and tested, with good fit.     

Prediction of the Probability of Graduation of Engineering Transfer Students

This study examined how retention of prose is affected by (1) outlines as advanced organizers, (2) preexperimentai familiarity with the material, and (3) text genre (i.e., narrative vs. expository prose). College students studied either a two-level outline, a one-level outline, or no outline before listening to 400 to 500 word passages that varied in familiarity and narrativity. Subjects were subsequently given a cued recall test or a 3-Alternative, Forced Choice test on the passages. Whereas outline condition and familiarity had no significant effects on retention, narrativity ratings on the passages predicted between 38% and 84% of the variance of retention scores. Stories were recalled much better than expository passages. These findings were discussed in the context of current theories in cognitive psychology, particularly those that have explored the structure, organization, and representation of knowledge and prose.     

A behavioristic interpretation of language

This essay argues that Bitzer's situational theory provides non‐deterministic causal explanations of rhetoric by recognizing the operation of external and internal factors upon rhetors and audiences, including the necessary role of perception. Understood in this way, the theory accounts for forms of rhetorical creativity through the definition of controlling elements of situations, for the production of rhetoric as purposive action, and for the degree of accuracy or clarity with which observable features of situations have been interpreted.     

Fashion in the classroom III: Effects of instructor attire and immediacy in natural classroom interactions

This is the third of three studies using complementary designs to investigate the effects of teacher attire on student perceptions of instructors and instruction in contemporary college classrooms. In line with Studies One and Two, modest effects of attire on perceptions of extroversion and competence were found; however, previous conclusions that instructor attire has little meaningful, predictable effect on ratings of attributes related to either approachability or credibility were reinforced. Student judgements of such attributes were influenced far more by teacher use of immediacy behaviors than by attire. In particular, positive effects resulting from teachers’ choice of formal professional attire were not supported.

This is the final study in a three‐part series designed to investigate the implications of instructor attire in the contemporary college classroom. Interest in this topic was sparked by collegial conversations regarding advice for new teaching assistants: What can they do to enhance credibility, approachability, and teacher evaluations? Does what they wear make a difference?     

The impact of curriculum change on health sciences first year students’ approaches to learning

This study aimed to use a learning inventory (the Approaches and Study Skills Inventory for Students, ASSIST) to measure the impact of a curriculum change on students’ approaches to learning in two large courses in a health sciences first year programme. The two new Human Body Systems (HUBS) courses were designed to encourage students to take a deep approach to learning. ASSIST was completed by 599 students enrolled in a biology class in 2006 that was part of the old curriculum, and by 705 students at the beginning and end of the new HUBS courses in 2007. Changes in students’ approaches to learning over time were examined. The ASSIST scores for both HUBS courses reflected the dominance of a surface approach, followed by a strategic and then a deep approach. However, by the end of the year, students were taking a deep and strategic approach to their studies to a greater extent, and a surface approach to a lesser extent. Moreover, students enrolled in the new course adopted a deep approach to their studies to a significantly greater degree than those studying the old curriculum. Despite the predominance of a surface approach, the results suggest that it is possible to bring about small but significant positive changes in students’ learning behaviour in a very large class through curriculum change. The proportion of students preferring a surface approach, and results showing that high performance on the final exam was significantly correlated with a surface approach, probably reflected contextual factors, including assessment, and is the focus of ongoing curriculum development.     

A study of the effect of HyperCard and pen-paper performance assessment methods on expert-novice chemistry problem solving

This study investigated HyperCard as a tool for assessment in science education and determined whether or not a HyperCard assessment instrument could differentiate between expert and novice student performance (balancing stoichiometric equations) in science education. Five chemical equations were presented by traditional pen-paper and by a HyperCard (Hyperequation) program. Thirty honors (expert) and 30 regular (novice) chemistry students were randomly divided into HyperCard and traditional pen-paper groups of 15 students each. Scoring was based on five dependent variables: performance scores, number of attempts, rate of attempts, time on task, and correctness. Correlation results indicated that students with high performance scores correctly balanced more equations, required fewer attempts to balance equations, and required less time per attempt than did students with low performance scores. MANOVA results showed that performance scores and correctness scores for both experts and novice were significantly higher on HyperCard compared to pen-paper assessment; the novice scores on HyperCard nearly equaled the expert pen-paper assessment scores. Significant interactions were found for time on task and for correctness. The results suggest that HyperCard can be a suitable tool for assessment in science education and that such an instrument can differentiate between expert and novice student performance.