Abstract
The purpose of this study was to describe the profile of the scientific thinking ability of junior high school students. This type of research is descriptive research. The target of this study was 223 junior high school students (13-15 years old) in Ngawi, East Java. This research uses the Classroom Test of Scientific Reasoning (CTSR) developed by Lawson, the result of revision in 2000 which has been translated by Asnawi into Indonesian. The test has a reliability coefficient, calculated by the KR-20 formula, of 0.76. This instrument consists of 24 multiple-choice questions. The result of the research obtained is the profile of the level of scientific thinking ability of junior high school students is 89.24% of students at the concrete level, 8.97% of students at the Low Formal level, and 1.79% of students at the Upper Formal level.
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