Abstract
This study was conducted to analyze the test instrument used to measure the ability of students in the odd semester final exam in mathematics. Sampling using purposive sampling technique. These students consist of 67 people. The questions given are in the form of multiple choice questions totaling 40 items related to the odd semester final exam material. The data analysis technique used quantitative descriptive analysis. The Rasch model is used to obtain fit items. This analysis was carried out with the help of Winsteps 3.73 software. From the output of the Winsteps program, 35 items were obtained according to the Rasch model with an average value of Outfit MNSQ for persons and items of 1.09 and 1.09, respectively. While the Outfit ZSTD values for person and item are -0,1 and -0,2 respectively. Meanwhile, the instrument reliability expressed in Cronbach's alpha is 0.77.
Highlights
Many test instruments still do not know the quality of the questions, so there is a quasi-assessment which has an impact on the actual ability of students who cannot be measured (Fauziana & Wulansari, 2021)
Based on the previous research in this study, the researcher wanted to know the quality of the test instrument used to measure students' abilities in the odd semester final exam in mathematics for class VIII SMP with the Rasch model approach
While the MNSQ Outfit, ZSTD Outfit and the correlation value of the item with the question as a whole show the limit of items that are declared fit with the model
Summary
In learning in the school environment, teachers play an important role in evaluating and assessing the subjects being taught (Palinussa & Thaib, 2020; Sutama et al, 2017). Other research conducted by (Imaroh et al, 2020) analyzing the items using the Rasch model can provide information about the quality of the items in the final test of the odd semester mathematics class VII Junior High School (SMP). Based on the previous research in this study, the researcher wanted to know the quality of the test instrument used to measure students' abilities in the odd semester final exam in mathematics for class VIII SMP with the Rasch model approach. This quality is measured based on several indicators, namely items that fit the Rasch model, level of item difficulty, and item reliability. Cronbach's alpha value will be determined to determine the reliability of the items
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