Students' critical thinking ability is still low in biology learning due to the lack of student activity in the teaching and learning process so that it is necessary to apply a reciprocal teaching-learning model. This model can make students become active during the learning process. This study aims to determine the effect of the reciprocal teaching-learning model on the critical thinking skills of SMA Negeri 4 Madiun students. The research design used is quantitative research with hypothesis testing using t-test. The research data was taken from the population of class XI MIPA at SMAN 4 Madiun which amounted to 120 students. The sampling technique was stratified random sampling, with class XI MIPA 3 as the control class and XI MIPA 4 as the experimental class. The results of the study by calculating the value hypothesis test obtained that t count (2.101) > t-table (2.0017), where H1 is accepted and H0 is rejected. This study concludes that there is an effect of the reciprocal teaching-learning model on the critical thinking skills of SMA Negeri 4 Madiun students.
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