Developing and Reporting Psychometric Evidence of Prerequisite Algebra Skills Instrument

Abstract

Background: Assessing prerequisite algebra skills among secondary school students is essential to learning to succeed in formal algebraic classes. Objectives: Therefore, this research aims to develop a prerequisite algebra skills (PAS) instrument in the context of early algebra for seventh grade. Design: It was conducted in quantitative descriptive and cross-sectional design. The PAS instrument developed was in the form of multiple-choice questions. Participants: Three experts were selected, and 85 Grade 7 students in West Java, Indonesia, participated in checking the psychometric evidence. Data Collection and Analysis: Experts filled out an assessment sheet to assess content validity and inter-rater reliability, which was analysed using a content validity index (CVI) and Kappa coefficient (κ). The construct validity and reliability were examined using the Point-Biserial correlation and Kuder-Richardson's 20. Results: The result of content validity revealed that overall instrument