Abstract:

Purpose: This study aims to develop a valid and reliable achievement test for measuring pressure. Design & Methodology: Eighty seventh-grade students constitute the sample of the study. A convenience sampling strategy was used in the selecting of the participants. In the first stage of the research, the objectives were determined, and then an item pool of 30 items was created. The content validity of the test was established with the help of specification table. In the selection of questions, exams and objective comprehension tests administered by the Ministry of National Education in the past years were used. In the pilot study, the test was administered to 20 students and two items were deleted based on pilot study data. After the actual implementation of the achievement test, overall test difficulty, overall test discrimination, item difficulty, and item discrimination values were calculated. Findings: The overall test difficulty value was .56, the overall test discrimination value was .47, and the KR-20 internal consistency coefficient was calculated to be .85. Five items were removed from the test based on the item difficulty and item discrimination values. As a result of the study, a valid and reliable test consisting of 23 multiple-choice questions was obtained. Implications & Suggestions: The developed achievement test can be used by researchers and science teachers to measure students' conceptual understanding of pressure.

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