A Validation Study of Elementary Science ISTEP+ Scores

A Validation Study of Elementary Science ISTEP+ Scores

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The Indiana Statewide Testing for Educational Progress-Plus (ISTEP+) was designed to assess student mastery of key educational goals. The 5th grade ISTEP+ Science Test (5-GIST) is part of the ISTEP+ testing regime. The Indiana Academic Standards were developed to guide instruction in the state, and questions on the ISTEP+ were aligned with these standards. Since its inception, the use of the ISTEP+ exam has been changed to comply with the dictates of both Indiana Public Law 221 and the national No Child Left Behind act. With these modifications, the purpose of the tests has shifted from assessment of individual student academic progress to evaluation of the quality of the educational institution administering the tests. The validity of this use has never been established. The purpose of this study is to assess the validity of the 5-GIST as an instrument for assessing and forming judgments about the quality of science instruction in a particular school. ISTEP+ scores of 2 cohorts of students in a Midwestern school district were converted into Z-scores and tracked from 3rd to 5th grade. A regression line was established to account for the general aptitude and the socio-economic status (SES) of the students. Examining the residuals of the 5-GIST scores revealed that between 57% and 60% of the variance in the scores can be attributed to the general aptitude and SES of the students, leaving between 40% and 43% that can be interpreted as reflecting the effect of the school on student learning.Ultimately, if that measure is to be used as an indicator of the quality of science instruction within a school, the ISTEP+ science achievement measure ... Shown are Pearson bivariate correlations with pairwise deletions, for all pairs of tests taken by the same student. That is, if a student took the 3rd and 5th grade ISTEP+ within the school district but not the 6th grade, then correlations between 3rd and 5thanbsp;...

Title:A Validation Study of Elementary Science ISTEP+ Scores
Author:Glenn Simonelli
Publisher:ProQuest - 2006


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