Examines aspects of pitch discrimination among listeners. Presents musical tones containing modulated frequencies to 30 musician and nonmusician participants. Uses a tone matching task to determine the discrimination of subjects. Matches a generated tone to a simultaneous tone performed with vibrato. Finds a significant difference among musicians…

This paper provides researchers with a method of determining sample size for a given power level in the preparation of a single group exploratory repeated measure analysis. The rationale for determining sample size which takes into consideration the powers and assumptions of both the adjusted univariate and multivariate repeated measures tests is…

The value of variance is emphasized, and the element of design, frequently not adequately understood, is clarified to underscore the importance of variance to the researcher. Two analytic methods, analysis of variance (ANOVA) and multiple regression, are discussed in terms of how each uses/applies variance. Advantages and major difficulties with…

This tutorial summarizes some of the widely known limitations of tests of statistical significance and then focuses on extracting measures of variation accounted for as a supplement to significance testing. Two measures of variation accounted for, eta squared and omega squared, are discussed. Computational formulas, computational examples, and…

This paper focuses on two methods of performing multiple comparisons (post hoc or unplanned versus a priori or planned) for determining exactly where statistically significant results arise when there are more than "k equals two" groups. Textbook views and recommendations regarding the use of these two types of multiple comparisons are…

Analysis of current models describing citer motivations identified seven most significant motivations for authors: currency scale, negative credit, operational information, persuasiveness, positive credit, reader alert, social consensus. Motivational background for more than 900 citational acts of 26 authors at University of Iowa were gathered and…

Of 193 special education studies that included significant interaction effects based on a two-way analysis of variance design, only 9% interpreted the significant interaction consistent with the accurate explanation of a differential or joint effect. Instead, the cell means comparison procedure explained the interaction in 77% of the…

School psychologists and education students and faculty were asked to distinguish between computer-generated and individually written psychological test comments and indicate cues used in making identifications. Even though results indicate correct identification did not differ significantly from chance, school assessment reports must provide more…

This study was conducted to determine effects of highlight and question placement in computer assisted instruction modules on untrained and trained objective test scores and attitudes of higher education students. Question and highlight use was superior to straight text; questions were superior for increasing untrained scores, but students…

For this evaluation of a multicultural education unit, Staged Innovation Design, which allows for experimental group posttest scores to be compared to control-replication group pretest and posttest scores to ascertain instructional effectiveness, was modified by adding a simultaneous pretest for both groups to control for threats to internal…

The wide availability of large amounts of inexpensive computing power has encouraged statisticians to explore many approaches to a basis for inference. This paper presents one such "computer-intensive" approach: the bootstrap of Bradley Efron. This methodology fits between the cases where it is assumed that the form of the distribution…

Describes a study which explored the effects on kindergarten children of a LOGO computer programing experience lasting one month (20 classes). Results indicate a positive effect as seen in greater gains by treatment group in dependent school readiness variables and no significant effect on creativity or self-concept. (MBR)

A study explored Protection Motivation Theory (PMT) in the context of news reports about a hazard. Content elements of outcome severity, vulnerability, and response efficacy were systematically varied in stories about a fabricated risk: fluorescent lighting lowering student academic performance. Research subjects were 206 students in an…

Statistical measures of practical significance report the extent to which variation in the dependent variable can be explained by the independent variable. Reports of special education research sometimes discuss practicality using the estimate of statistical significance. Practical significance, however, may vary greatly among samples even though…

Describes a study of second, third, and fourth grade children in Israel to determine if computer assisted instruction is utilized differently by different groups of students (younger and older), and extent to which effort expenditure (total amount of time a child is engaged at the computer) is related to achievement. (MBR)