A.Z. Fathin, H. Retnawati
National Standardized School Examination is one of the exams used to determine the graduation of vocational school students. This study aims to determine the characteristics of mathematics National Standardized School Examination items in 12th Vocational School. This research is a descriptive explorative quantitative research. The data used is the mathematics National Standardized School Examination kits at a vocational school in the city of Yogyakarta and participant's answers collected with documentation. These assessment kits are validated by experts and analyzed its characteristics using the classical test theory approach. The results of the study indicate that content validity obtains the Aiken index value (V) of 0.94, which means that this instrument is very valid for all items. Reliability for this instrument is categorized as a medium with a reliability coefficient of 0.3623. The results of the characteristic analysis showed that 18 items are having moderate difficulty, and there are 17 difficult questions. Based on the discrimination index, there are 6 items included in the good category, and the other 19 items are categorized as not good. Furthermore, in terms of the effectiveness of the distractors, this instrument can be said to be effective because 82.86% of the items have effective distractors. © Published under licence by IOP Publishing Ltd.
Department of Mathematics Education, Graduate Program, Universitas Negeri Yogyakarta, Indonesia
