The study aims at finding (1) the effect of project-based learning and problem-based learning on student's creativity and critical thinking and (2) the difference effect of project-based learning and problem-based learning on student's creativity and critical thinking. This study is quasi experiment using non-equivalent control-group design. Research population of this study was all classes in eleventh grade of mathematics and natural science program of SMA N 1 Temanggung. The participants were 102 students. This study used three classes as research sample which implemented three different kinds of learning models in respiratory system. XI MIPA 3 was as an experimental group implementing project-based learning and XI MIPA 5 was as an experimental group implementing problem-based learning, while XI MIPA 1 was as control group. Data was collected using two instruments to measure student's creativity and student's critical thinking. Data was analysed using t-test, multivariate analysis, and univariate analysis. The results reveal that (1) project-based learning and problem-based learning affect student's creativity and critical thinking; (2) there is a difference effect of project-based learning and problem-based learning on student's creativity; and (3) there is no difference effect of project-based learning and problem-based learning on student's critical thinking.
Numerous challenges occur in education field require effective solutions to encounter. The aim of this research was to investigate the effectiveness of guided inquiry model with starter experiment approach in teaching science process skill. This quasi-experimental research employed non-equivalent control group design. A total of 64 students of X MIPA1 and X MIPA5 was selected as the sample. In selecting the sample, the researchers applied cluster random sampling while the data was collected by using test. The data was analyzed using ANCOVA after underwent prerequisite normality and homogeneity tests (α = 0.05). The results showed that the mean of posttest was 79.33%. The improvement of science process skill was 44.88%, compared to the pretest results. The results of ANCOVA revealed that the significance value was of 0.025. This means that the guided inquiry model with starter experiment approach in teaching science process skill of the students is effective.
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