Using the Rasch Model to Develop a Measure of Students Problem Solving Ability in Optical Instruments
Abstract
Abstract: This study aims to develop a test instrument for problem-solving abilities in the material of optical instruments. The research method used is the development of a 4D model consisting of defining, designing, developing, and disseminating. Participants in this study consisted of 75 consisting of 40 males and 35 females in grade 12 high school sciences program at a high school in Bandung. Based on the results of the analysis, it was obtained (1) expert validation with a CVR index value of 1 and the test instrument included in the valid category, (2) construct validation using Rasch was declared valid, (3) the reliability of each item using Rasch analysis was declared reliable with Cronbach alpha of 0.96, and (4) the difficulty level of the items is evenly distributed at each level of difficulty. Therefore, the test instrument that has been developed can measure students' problem-solving abilities in the material of optical instruments.
Keywords: pemodelan Rasch, problem solving ability, optical instruments.
Abstrak: Penelitian ini bertujuan untuk mengembangkan intrumen test kemampuan pemecahan masalah pada materi alat-alat optik. Metode penelitian yang digunakan yaitu pengembangan model 4D yang terdiri dari defining, designing, developing, dan disseminating. Partisipan dalam penelitian ini terdiri dari 75 yang terdiri dari 40 laki-laki dan 35 perempuan pada kelas 12 SMA program Ilmu Pengetahuan Alam di salah satu SMA di Bandung. Berdasarkan hasil analisis diperoleh (1) validasi ahli dengan nilai CVR indeks sebesar 1 dan instrumen tes termasuk dalam kategori valid, (2) validasi kontruk menggunakan Rasch dinyatakan valid, (3) reabilitas setiap butir soal dengan analisis Rasch dinyatakan reliabel dengan Cronbarch Alpha sebesar 0,96, dan (4) tingkat kesukaran butir soal merata pada setiap tingkat kesukaran. Oleh karena itu, instrumen tes yang telah dikembangkan dapat mengukur kemampuan pemecahan masalah peserta didik pada materi alat-alat optik.
Kata kunci: pemodelan Rasch, kemampuan pemecahan masalah, instrument optik.
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