Validity and Reliability of Assessment Instruments for Analytical Thinking Ability and Chemical Literacy in the Colligative Properties

Abstract

This study aimed to develop and determine the construct validity, reliability, and items analysis of the instruments for assessing analytical thinking abilities and chemical literacy in the colligative properties materials. This study was a research and development (R&D) utilizing the ADDIE model. The subjects of this study were 30 students of class XII at senior high school (SMA) in Bengkalis. The results revealed that of the 15 items on the analytical thinking skills and chemical literacy, 10 items had good construct validity and had very high reliability test values, with the Cronbach alpha of 0.887. The results of item analysis of the instrument which was developed for assessing the analytical thinking skills and chemical literacy showed that for the difficulty indices, 80% of the items were classified as moderate items and 20% of them were classified as easy items. Then, the analysis results for the discrimination indices revealed that 80% of the items were good while 20% of the items were categorized as satisfactory. In addition, based on the analysis of construct validity, reliability, and items analysis, the assessment instrument for analytical thinking ability and chemical literacy was valid and feasible to be used to measure the students’ analytical thinking skills and chemical literacy on the material of colligative properties on a broad scale test.