The present study aims to investigate the effectiveness of Research Based Learning (RBL) in improving students' learning achievement in solving two dimensional arithmetic sequence problems. The study applied triangulation method including qualitative and quantitative methods. The research subjects were 4thsemester students of higher education. The quantitative method was applied to analyse the learning achievement test, while the qualitative one was applied in the form of observation and interview. The collected data were analysed by using inferential statistics t-test. The result of t-test indicates that the sig (2-tailed) of independent sample t-test of pre-test is 0.853 (p>0,05), thus it is not significant. It implies the two classes are homogeneous in term of student achievement test. The data analysis of independent sample t-test of post-test, the sig (2-tailed) is 0.00 (p=<0,05), thus it is significant. It implies that the student achievement tests of two classes are different after the implementation of RBL. It shows that the students' achievement result of experimental class is better than the control class. The implementation of RBL is proven effective in improving students learning achievement in solving two-dimensional arithmetic problems.
Developing critical and collaborative thinking skills among learners was of significant importance in the 21st-century era. In this study, the researcher applied teaching and learning based on Research-Based Learning (RBL) to know the level of students critical thinking skill. The number of research samples was 30 students. This study used a triangulation research method, namely a combination of qualitative and quantitative methods. The quantitative method was obtained by using a learning outcome test and the qualitative method is obtained using a questionnaire and interview. Then the data that has been collected was analyzed using a t-test. Four students were chosen to represent critical thinking level 4, 13 students were chosen to represent Critical Thinking level 3, and 6 students were chosen to represent critical thinking level 2, 4 students were chosen to represent critical thinking level 1, and 3 students were chosen to represent critical thinking level 0. More subjects would be involved until the data was saturated. Students on low critical thinking were at Level 0. Based on the interpretation result of the t-test value, there was a significant difference between the control class and the experimental class, proved by the 0.000 figure in the statistical analysis. Therefore, it proved a significant difference in learning outcomes. However, the data that we obtained present a significant difference between the control class and the experimental class below 0.05. After we interpreted t-tabel = 2.04 on degrees of freedom 0.025, t-count of 0.000 was evident. Thus, a hypothesis was accepted since it was below 0.025. Qualitative methods show the results of interviews with 2 students.
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