Rasch Model Application: Identification of Students’ Conceptual Understanding of Static Fluid

Abstract

This research aimed to determine the level of student conceptual understanding of Static Fluid material using the Rasch Model. The study used a cross-sectional survey with a quantitative descriptive approach. The sample was invited using simple random sampling of as many as 50 students of class XI Science in Malang Regency. The research used 15 multiple-choice questions on the conceptual understanding of static fluids. Research data analysis used the Rasch Model, assisted by Ministep software version 4.8.2.0. Based on the results of data analysis, it was concluded that the average distribution of the ability to understand static fluid concepts was above the standard average difficulty of the questions. This is indicated by 34 out of 50 students falling into the high and medium ability categories, meaning that students' conceptual understanding of static fluid material is quite good. The results of this research also found that students' conceptual understanding in the sub-chapter of Archimedes' principle was relatively low, as evidenced by 13 students answering correctly the question of conceptual understanding in this sub-chapter. Meanwhile, students' conceptual understanding of the hydrostatic pressure sub-chapter is relatively high, as indicated by 47 students answering correctly the question of conceptual understanding in this sub-chapter. This research is beneficial in providing a clear picture of students' conceptual understanding of static fluid material, highlighting areas where students still face difficulties. Teachers can use this information to design appropriate teaching strategies. Additionally, applying the Rasch model in evaluating conceptual understanding can enrich the literature in physics education.