Conducting research with human subjects can be difficult because of limited sample sizes and small empirical effects. We demonstrate that this problem can yield patterns of results that are practically indistinguishable from flipping a coin to determine the direction of treatment effects. We use this idea of random conclusions to establish a…

Context: A perennial problem in applied statistics is the inability to justify strong claims about cause-and-effect relationships without full knowledge of the mechanism determining selection into treatment. Few research designs other than the well-implemented random assignment study meet this requirement. Researchers have proposed partial…

Despite the importance of scientific inquiry in science education, researchers and educators disagree considerably regarding what features define this instructional approach. While a large body of literature addresses theoretical considerations, numerous empirical studies investigate scientific inquiry on quite different levels of detail and also…

Many interactions are found with categorical variables but few with continuous variables, suggesting that, from a mathematical point of view, investigating interactions with continuous variables is less powerful than with categorical variables. This issue is analyzed from three other points of view: study design, measurement of the independent…

Several aspects of interview research heretofore receiving little attention are discussed. A brief description of the different types of interview formats and levels of analysis is presented. Following a discussion of the problem of analyzing protocol data, some suggestions are offered about analysis procedures that derive from constructionist…

Delineates various levels of theory with implications for research in library and information science. Based upon a review of literature on theory building and research methods in the social sciences, a model is proposed which displays a taxonomy of theory in hierarchical form. (EM)

Statistical methods, called latent variable models, have been developed to provide rigorous tests of theories involving unobserved variables. This paper describes the major types of latent variable models, shows how they can be applied in educational research, and gives representative examples of their use from the literature. (Author/BW)

Discusses the use of hypothesis testing research and hypothesis generating research designs. Researchers investigating teacher development should continue to use hypothesis generating research designs to depict, relate, and conceptualize information in this area. Hypothesis testing research designs could check the accuracy of these initial…

Argues that R. Trapp's reservations regarding the characterization of Jackson's and Jacobs' conversational argument are unfounded. Reports several studies that use procedures similar to those employed by Trapp to confirm Jackson's and Jacobs' theory. Discusses reservations about using subject generated judgments as an unproblematic standard for…

Presents an opinion on the appropriate use of significance tests, especially in the context of regression analysis, the most commonly encountered statistical technique in education and related disciplines. Briefly discusses the appropriate use of power analysis. Contains 47 references. (Author/SV)

The similarities between television viewing and fantasy activity (daydreaming, reverie, mind-wandering, internal dialogue) more than warrant the building of a theoretical construct, especially in the context of recent empirical research on television viewing consequences. A construct of the television viewing process, based on cognitive theories…

Two methodological problems often arising in dyslexia research are considered. The first problem concerns the validity of experimental measures and the related problem of interpreting null results. The second problem involves the effects of sampling from a disabled population if the disorder under investigation has multiple unknown origins.…

Reviews traditional functions of interaction in computer-based instruction (CBI); describes quantitative and qualitative perspectives on interaction strategies; discusses design-centered and learner-centered interaction; and presents methods for promoting cognitive engagement via mathemagenic and generative interaction strategies, including…

Despite numerous counselor training programs that espouse a scientist-practitioner orientation, rivalry, rather than collegiality, is often present between researchers and counselors. This article presents a teaching template intended to decrease this tension by highlighting similarities between the two professional specializations. Implications…

Describes a systematic method for producing pictures to accompany textual instructional materials. The resulting instructional design model is then used in an attribute by treatment interaction study of post-secondary school students that was designed to investigate the role of analogical pictures in adult learners' acquisition of higher level…