Analysis of Instrument Quality Mathematical Representation Ability and Self-Confidence In Circle Learning
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Abstract
This study aimed to develop and validate instruments for measuring students’ mathematical representation ability and self-confidence in learning about circles. Using a quantitative descriptive method, the study involved 30 junior high school students in Yogyakarta. The instruments consisted of a mathematical representation ability test and a self-confidence questionnaire. The results showed that both instruments had high validity and reliability. The test items demonstrated moderate difficulty and good discrimination. Thus, the instruments were considered feasible for measuring students’ mathematical representation ability and self-confidence. Furthermore, students’ mathematical representation ability was categorized as moderate. In terms of representation indicators, symbolic representation was in the high category, while visual and verbal representations were in the moderate category. Students’ self-confidence was also classified as moderate. These findings suggest that although the developed instruments demonstrated good measurement quality, students’ mathematical representation ability and self-confidence still need improvement, particularly in visual and verbal representation.
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