Effect of Application of Learning Model Group Investigation on Critical Thinking Ability of Mathematical High School Students
Critical thinking skills of mathematics students are still low. Teachers lack training critical thinking ability ofstudents during learning. This study aims to examine differences influence learning model group investigationandconventional learning models to the critical thinking skills of mathematics students. The research design was pretestposttest control group design. The study population was all students in grade X SMAN 3 Kendari comprising 9 parallelclasses. Samples were taken by purposive sampling, such as taking two classes that have the mathematical ability and thevariance is relatively the same. Both classes were then randomized to determine the experimental class (34 students) andcontrol class (32 students). Data collected through the provision of critical thinking skills tests as essay test form. Datawas analyzed by descriptive and inferential test using t test at the 0.05 significance level. The results showed that: (1)there is an effects of the application of learning model group investigation of the critical thinking skills of mathematicsstudents with an average N-Gain of 0.55 (medium); (2) there is an effect of the application of conventional learningmodels to the critical thinking skills of mathematics students with an average N-Gain of 0.283 (low); and (3) applicationof the learning model group investigation is more influential than the application of conventional learning model tomathematics students' critical thinking skills.