A Rasch model measurement analysis on students’ concept mastery in food additives topic

The students’ concept mastery is low in food additives topic in junior high school level. This study aims to analyze students’ concept mastery by using Rasch Model Measurement. The participants involved 70 students of grade VIII and IX grades consist of 30 boys and 40 girls. The result was shown from students have already studied food additives topic. Item is comprised of 30 multiple-choice questions. Data analyzed on person-reliability, item-reliability, and wright map. The findings showed Cronbach α was 0.69 (sufficient), item-reliability was 0.92 (excellent), and person-reliability was 0.65 (weak). It shows interaction between students and items were sufficient, so items can be used for students. Thus, most students could answer food additives questions. For better result, the researcher should make difficult item.