Development of Three Tier Static Electricity Diagnostic Test to Identify Student Conceptions About Static Electricity

Abstract

The purpose of this research was to develop and validate Three Tier Static Electricity Diagnostic Test (TTSEDT). The development procedure consists of four stages: define, design, develop, and validation. The subjects of this study consist of 2 physics education experts and 120 high school students, in 12th grade. The response of two experts was used to determine the content validity of TTSEDT. Meanwhile, the students\u27 responses were used to determine the items internal consistency, discrimination index, difficulty index, and reliability index. The reliability of TTSDET was determined by KR-20. The results showed that: (1) TTSEDT meet content validity which means that TTSEDT items are really measures the students\u27 conceptions and misconceptions about static electricity; (2) the items internal consistency index is in the interval 0.20-0.47; (3) the items discrimination index is higher than 0.20; (4) the difficulty index of test items is in the interval of 0.25 - 0.75;  (5) the reliability index  of TTSEDT is 0.73 (p<0.05). TTSEDT is a valid, reliable, and effective instrument for identifying students\u27 conceptions of static electricity