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Dunst, Carl J.; Hamby, Deborah W. – Journal of Intellectual & Developmental Disability, 2012
This paper includes a nontechnical description of methods for calculating effect sizes in intellectual and developmental disability studies. Different hypothetical studies are used to illustrate how null hypothesis significance testing (NHST) and effect size findings can result in quite different outcomes and therefore conflicting results. Whereas…
Descriptors: Intervals, Developmental Disabilities, Statistical Significance, Effect Size
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Paul, Timothy A.; Paul, Phyllis M. – Contributions to Music Education, 2009
This study sought to determine if using changing syllables would facilitate a smoother slur for middle school trumpeters playing ascending perfect fifths, both natural and valved. Participants (N = 42) were randomly assigned to one of two groups, control and experimental, and each performed a pretest and a posttest. Students in the control group…
Descriptors: Experimental Groups, Control Groups, Middle School Students, Intervals
Cabalo, Jessica Villaruz; Vu, Minh-Thien – Empirical Education Inc., 2007
The Maui Hawaii Educational consortium (the Maui School District and Maui Community College) sought scientifically based evidence for the effectiveness of the "Cognitive Tutor (CT) Algebra I Curriculum" to inform adoption decisions. Decision makers were particularly interested in whether the use of the "CT" program affects…
Descriptors: Access to Computers, Program Effectiveness, Algebra, Community Colleges