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All Journal Saqbe : Jurnal Sains dan Pembelajarannya
Sukmawati Ira Saputri
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Application of the Rasch Model for Validating Representational Systems and Chemical Reactions Diagnostic Instrument (RSCRDI) Yusfa Lestari; Nurqadriyanti Hasanuddin; Sukmawati Ira Saputri; Salizmi Zulfi Maulidita
Saqbe: Jurnal Sains dan Pembelajarannya Vol 1 No 2 (2024): Saqbe : Sains dan Pembelalajarannya (Oktober 2024)
Publisher : Universitas Sulawesi Barat

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Abstract

This study seeks to evaluate the validity and reliability of the outcomes derived from the adoption of the Representational Systems and Chemical Reactions Diagnostic Instrument (RSCRDI). This research employs a quantitative, survey-based approach, involving 69 prospective chemistry teachers at a university in Indonesia. Prior to implementation, the instrument was translated from English to Indonesian using the back-translation method. The collected data were subsequently analyzed using Winstep, yielding strong validity and reliability results. The instrument exhibited a Cronbach's alpha of 0.65, a person reliability of 0.60, and an item reliability of 0.76. Furthermore, the construct validation results were favorable, as evidenced by mean score (MNSQ), Z-standard (ZSTD), and point measure correlation (Pt Mea Corr) indices. These findings indicate that the RSCRDI is a valid and reliable instrument for assessing conceptual understanding among prospective chemistry teachers in Indonesia.
Co-Authors Nurqadriyanti Hasanuddin Salizmi Zulfi Maulidita Yusfa Lestari