Development of a Scientific Explanation Competency Test on Sound Waves for Upper Secondary School Students

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Krissada Tongprapai

Abstract

The objective of this research was to develop a scientific explanation competency test on the topic of sound waves for upper secondary school students. The development process comprised five stages: 1) defining the operational definitions of scientific explanation competency regarding sound waves; 2) conducting content analysis and determining the test structure and number of items; 3) constructing test items and specific scoring rubrics; 4) evaluating the validity and suitability of the instrument; and 5) refining the test for pilot testing to determine its psychometric properties, including difficulty, discrimination, reliability, and the quality of the scoring rubrics.


The results indicated that the developed extended-response subjective test possessed content validity and was suitable for implementation. The instrument was pilot tested with a sample of 40 Grade 11 students from a large secondary school in Phrae Province, who had previously studied sound waves but had no formal training in constructing scientific explanations. The analysis revealed that the difficulty index ranged from 0.469 to 0.500, and the discrimination index ranged from 0.325 to 0.363. The test achieved a Cronbach’s alpha coefficient of 0.719, while the Intraclass Correlation Coefficient for inter-rater reliability of the scoring rubrics ranged from 0.766 to 0.913. Consequently, the developed test is an effective tool for assessing the scientific explanation competency of upper secondary school students regarding sound waves.


 

Article Details

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Research Article

References

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