Project Based Learning Model Assisted by STEM Teaching Materials on Students' Critical Thinking Skills

This research is a quasi experimental research that aims to determine the differences and the improvement of mastery of physics concepts in the classroom using contextual teaching materials that integrated local wisdom with classes using conventional teaching materials. The research design used was pretest posttest control group design. Both the experimental and control classes are given equal treatment, but the experimental class uses contextual teaching materials that integrate local wisdom while the control class uses conventional teaching materials. The number of students in the experimental class is 25 students while the control class is 30 Students. The data analysis used parametric statistics with a two tailed t test to determine the difference and the N-gain test to find out the improvement of student conceptualization. The two tailed t test used SPSS 20 software assistance in the data analysis process. Based on result of data analysis that obtained Sig value. (2-tailed) by 0.000 <0.01 (α = 1%). This shows that there is a very significant difference between physics learning through problem solving method using contextual teaching materials with physics learning through problem solving using conventional teaching materials. In addition, based on the N-gain calculation the average value of N-gain for the experimental class is 0.87 with the high category whereas the average value of N-gain for the control class is 0.65. This shows that the experimental class where the physics learning using materials Contextual teaching has increased the mastery of the concept higher than the control class that uses conventional teaching materials.

This research was conducted based on the results of observations and interviews on the low critical thinking skills of students in elementary school cluster 9 Pasawajo sub-district which had an impact on student learning outcomes. The purpose of this study was to analyze the differences in the effectiveness of the multiple intelligences-based discovery learning model with the discovery learning model on the science critical thinking skills of fifth grade elementary school students. This type of research uses quantitative methods with a quasi experimental design that applies experimental and control classes. Data collection techniques were carried out by observing, giving tests, student response questionnaires and documentation. The samples of this study were the fifth grade students of SDN 113 Buton as the experimental class and the fifth grade students of SDN 91 Buton as the control class. The research instrument was conducted by first analyzing the results of the test trials including the validity of the reliability, the level of difficulty, and the differentiating power of the questions. The data analysis technique used was normality test, homogeneity test, completeness test and hypothesis testing using independent sample t-test after which the gain test is carried out. The results of the study can be concluded that there was a significant difference in the effectiveness of students' critical thinking skills between the multiple intelligences-based discovery learning model and the discovery learning model. The results of the average difference test using the independent sample t-test obtained a sig value. (2-tailed) the experimental and control classes were 0.000 < 0.05, so Reject H0 which means that there are differences in critical thinking skills. The results of classical completeness using the Z test obtained that the experimental class achieved more than 75% completeness and the control class was less than 75%. The data results from the experimental class gain test obtained a gain value of 0.56 higher than the control class with a value of 0.42 even though both classes were in the medium gain category, but the experimental class increased higher than the control class. Keywords: discovery learning Model, multiple intelligences, critical thinking ability, learning science.

This study was aimed to identify student’s critical thinking skills through the use of integrated sciences teaching materials on pressure topic. This study was conducted at one of SMP in Cimahi, West Java, Indonesia for the 2015/2016 academic year. It used experimental method with nonequivalent pretest-posttest control group design. There were two classes involved, the experiment class where the students using the integrated sciences teaching materials, while the control class using conventional teaching materials provided at school. Data was respectively collected and analyzed by using student’s critical thinking skills test and data analysis tools SPSS version 21. The result shows that there is a significant difference in student’s critical thinking in student taught using integrated sciences teaching materials those taught with conventional teaching materials. It can be concluded that there is improvement in critical thinking skills of students in the experiment class compared to the control class. In addition, this study provided of positive impacts on student’s active learning and independent learning.

Abstract: A research on the application of the learning methods of problem solving in the colloidal material class XI Science SMAN 4 Banjarmasin. This study aims to determine (1) differences in critical thinking skills students learn to use problem solving methods with conventional learning, (2) a response to the problem solving method in class XI IPA. Methods This study used a pretest- posttest nonequivalent control group design. Research sample is class XI Science SMAN 4 Banjarmasin which consists of class XI IPA 3 as the experimental class and class XI Science 2 as the control class. Data collection techniques using critical thinking skills tests and questionnaires. Statistical analysis using t-test, test for normality and homogeneity tests. The results showed that (1) there is a difference between the critical thinking skills that students learn to use problem solving methods with students who learn using conventional learning methods, namely the experimental class and 74.8% in the control class is 70.41% (2) response to learning of problem solving methods are categorized both by 32.2%. Keywords: problem solving, critical thinking skills, colloidal

This research aims to examine the effect of the project-based learning model on elementary school students' 4C skills. This research is a quasi-quantitative experimental research. The sampling technique used at the SD Negeri 2 Perm Way Kandis location was an arbitrary cluster technique. The research sample consisted of two groups: experimental class IV A, totaling 28 students, and control class IV B, totaling 30 students. Data collection techniques use tests and questionnaires. Data analysis techniques use normality tests, homogeneity tests, and hypothesis tests. The results of data analysis can be used to identify the impact of critical thinking skills and creativity. The average pretest score for the experimental class was 40.89, the posttest score was 81.07, the average pretest score for students in the control class was 44, and the posttest score was 80.16, higher in the experimental class than the control class. Based on the analysis of experimental class student questionnaire data, the questionnaire data was used as a measuring tool for students' level of skill achievement, communication, and collaboration in the experimental and control classes, and an average score of 82 was obtained. Furthermore, the average score for the control class was 79.5. The results of the t-test using the SPSS StatisticsV for Windows application obtained a value of Sig<0.05(5) on Sig(two-sided), namely 0.000<0.05(5) for 28 students. Based on this research, PJBL has a significant impact on improving students' 4C skills.

This research aims to evaluate the effectiveness of using case method-based teaching materials with QR code videos on undergraduate students' critical thinking skills in mechanics. This research used a quasi-experimental method with a post-test-only control group design. A sample of 2 classes was taken using a purposive sampling technique. The experimental class used case method-based mechanics teaching materials and videos in QR codes, while the control class used print-outs of material summaries. Data collection was carried out through observation and critical thinking skills tests. Critical thinking skills test results data were analyzed using descriptive and inferential statistics. The t-test of two independent non-homogeneous samples is used to test the hypothesis of differences in means. The t-test results showed a difference in the average critical thinking skills scores of experimental and control class students with , greater than at (rounded up to 43). Based on these results, using case method-based mechanics teaching materials and videos in QR codes effectively develops students' critical thinking skills with an effectiveness level of 0.82, which means highly influential.

This study aims to determine the effect of the Discovery Learning model assisted by E-LKPD on students' physics learning outcomes. The research was conducted at SMA Negeri 1 Percut Sei Tuan. This type of research is a quasi-experimental design with a pretest-posttest control group design. The sampling technique used in this study was cluster random sampling, consisting of an experimental class and a control class, each with 36 students. The solution to address the research problem was to apply the Discovery Learning model assisted by E-LKPD in the experimental class and conventional learning in the control class. The subjects of this study were students in classes X-3 and X-4. The instrument used was a learning test in the form of 15 multiple-choice questions. Before the different treatments were applied, a pretest was conducted, resulting in an average pretest score of 48.1 for the experimental class and 45.6 for the control class. Normality and homogeneity tests on the pretest data indicated that both classes' data were normally distributed and homogeneous. The two-tailed t-test resulted in a value of tcount < ttabel = = 0.97 < 1.994, which means H0 was accepted, indicating that the initial critical thinking ability of the experimental and control classes was the same. After the different treatments, a posttest was conducted for both classes, which resulted in an average posttest score of 76.5 for the experimental class and 63.5 for the control class. Normality and homogeneity tests on the posttest data showed that both classes' data were normally distributed and homogeneous. The one-tailed t-test resulted in tcount < ttabel = = 4.860 > 1.666, so the alternative hypothesis (Ha) was accepted. It can be concluded that the use of Discovery Learning assisted by E-LKPD has a significant effect on students' learning outcomes on the topic of work and energy in class X at SMA Negeri 1 Percut Sei Tuan.

Background. In the current era of digital education, enhancing students’ engagement and conceptual understanding in physics remains a challenge. Traditional teaching methods often lack the interactive components necessary for deep learning. Research Purpose. This study aims to determine the impact of the E-LKPD-assisted discovery learning model on students' learning outcomes of effort and energy. Research Method. At SMA Negeri 1 Medan, the study was carried out. This kind of study uses a pretest-posttest control group design and is quasi-experimental in nature. With 36 students in each of the experimental and control classes, cluster random sampling was the sampling method employed in this investigation. In the experimental class, the Discovery Learning model was used with the help of E-LKPD, whereas in the control class, traditional learning was used. The pupils in grades X-3 and X-4 served as the study's subjects. A learning exam consisting of fifteen multiple-choice questions served as the tool. Findings. A pretest result in an average pretest score of 48.1 for the experimental class and 45.6 for the control class. Normality and homogeneity tests on the pretest data indicated that both classes' data were normally distributed and homogeneous. The two-tailed t-test resulted in a value of tcount < ttabel = = 0.97 < 1.994, indicating that the initial critical thinking ability of the experimental and control classes was the same. After the different treatments, a posttest was conducted for both classes, which resulted in an average posttest score of 76.5 for the experimental class and 63.5 for the control class. Normality and homogeneity tests on the posttest data showed that both classes' data were normally distributed and homogeneous. The one-tailed t-test resulted in tcount < ttabel = = 4.860 > 1.666, so the alternative hypothesis (Ha) was accepted. Conclusion. Students’ learning results on the subject of effort and energy are significantly impacted by the usage of Discovery Learning with E-LKPD assistance.

The purpose of this research to determine that the effect of the Problem Based Learning (PBL) learning model on critical thinking skills of class X SMKN 1 Sooko Mojokerto, to determine that the effect of Problem Based Learning (PBL) learning model on learning outcomes of class X SMKN 1 Sooko Mojokerto, to determine the implementing of Problem Based Learning (PBL) learning model to the basic competence in implementing maintance procedures archive at SMKN 1 Sooko Mojokerto in academic year 2019/2020. This the research design that used was quasi experimental with method non-equivalent control group design. The research were all students of class X OTKP 2 and X OTP 3 and class X OTKP 3 as the control class and X OTKP 2 as the experimental class. The instrument that used was a critical thinking skill test and multiples choice test to measure student learning outcomes and the technique pf anlizing, data used homogeneity test, normality test, gain score analysis, and t test (hypotesis). The result indicate that the Problem Based Learning (PBL) learning model had a significant effect on critical thinking skills as evidence by the acquisition of t-test with a significant level of 0.000 (0,00) < 0,05. The result also showed that the Problem Based Learning (PBL) learning model has a significant effect on student learning outcome as evidence by the acquisition with a significance level of 0.000 (0,00) < 0,05. In addition, the experimental class has an average of critical thinking skilss higher than the control class with the conventional learning model with an average of 83 experimental classes and 72 control classes. On the average of posttest learning outcome the experimental class has an average higher than control with an experimental average of 85,29 and control class of 74,85. So it was concluded that Problem Based Learning (PBL) learning model had an influence the crtical thinking skill an learning outcomes of students of class X OTKP SMKN 1 Sooko Mojokerto.

This study aims to determine the effect of using interactive learning media based on wordwall in increasing the learning motivation of junior high school students. This type of research is a quasi-experimental (non-equivalent control group design) with a quantitative approach. The population is all 30 students in grade VII. The sample used is grade VII students consisting of two classes, namely class VII A as an experimental class consisting of 15 people and class VII B as a control class consisting of 15 people. The sampling technique uses saturated sampling. The data collection techniques consist of questionnaires, observation and documentation. As well as data analysis using prerequisite tests namely normality test, homogeneity test, and hypothesis test (t test). Data were obtained through pretest and posttest questionnaires. Based on the results of the study, it was obtained that student learning motivation in the experimental class after the use of wordwall media was 14 students or 94% who had very high motivation criteria and 1 student or 6% who had high motivation criteria. Meanwhile, in the control class that used picture media, there were 5 students or 33% who had very high motivation criteria and 10 students or 67% who had high motivation criteria. After that, the average value of the pretest questionnaire in the experimental class was 69.47 and the control class was 59.73. While the results of the posttest questionnaire showed an average of 89.73 for the experimental class and 80.40 for the control class. Based on the results of the posttest questionnaire in the experimental and control classes, it can be seen that the value of the experimental class questionnaire is greater than the value of the questionnaire in the control class, namely 89.73>80.40. So it can be concluded that the use of interactive learning media based on wordwall is more effective in increasing student learning motivation and can be shown from the results of the t-test which obtained a significance value of 0.000<0.05 which means Ha is accepted and Ho is rejected.

The goal of This research are to understand the use role playing method impact on student’s critical thinking skills and the effectiveness of role playing method on students' critical thinking skills. This research is a quasi-experimental study using a non-equivalent control group research design. The population of this research is all of class VII of SMP Negeri 1 Berbah in academic year 2020/2021. The sampling technique in this study uses the Cluster Random Sampling method. By using the random sampling cluster technique, carrying out the class selection for the sample randomly, class D was obtained as experimental class and class C was obtained as the control class. The experiment class was using role-playing methods while the controlled class was using conventional methods. The data collection instrument consisted of pretest and posttest questions of critical thinking skills. The pretest-posttest score are used to obtain data for this study. The data analysis technique used are the prerequisite test in the form of normality and homogeneity tests and parametric statistical tests in the form of independent sample t-test, n-gain analysis and effect size. The results of this study showed that there is a significant effect in the use of role-playing methods on critical thinking skills of the students. From this study, it can be concluded that the role-playing methods are effective for the improvement of critical thinking ability of the students.

Background: This study was motivated by the importance of critical thinking skill in solving problem and making the decision. In addition, low level of students’ critical thinking skills issue in mathematics learning, particularly in trigonometry Aims: To address this issue, a STEM-integrated Project-Based Learning (PjBL-STEM) model was implemented. Method: This study employed a mixed-method approach combining quantitative and qualitative data. The sample consisted of 50 tenth-grade students at SMA Negeri Manufui, divided into an experimental class; 25 students and a control class; 25 students. Data were collected through a critical thinking skills test, student response questionnaires, and interviews. Results: The results of the independent samples t-test showed a significant difference between the experimental and control classes (Sig. = 0.001 < 0.05). The mean posttest score of the experimental class (52.83) was higher than that of the control class (45.33). The N-Gain analysis indicated a low improvement category in both classes; however, the experimental class (26.29%) showed a higher increase compared to the control class (4.50%). Student responses toward the PjBL-STEM implementation were highly positive, with more than 90% agreement. Qualitative findings revealed that project-based experiences helped students recall concepts, identify reasoning errors, and reflect on problem-solving processes. Conclusion: STEM-integrated PjBL model was effective in improving students’ critical thinking skills and fostering active, collaborative, and meaningful learning. Continuous implementation supported by structured guidance and critical thinking exercises is recommended to achieve more optimal learning outcomes.

The study aimed to determine the effect of applying a contextual approach to students' critical thinking skills in mathematics on cube and beam material. This research is a quasi-experimental quantitative research design with pretest-posttest control group design. The population in this study were eighth-grade students at Junior High School of St. Thomas 1 Medan. The sample in the study was selected by random sampling consisting of the experimental class (VIII-D) and the control class (VIII-E). The pretest and posttest results were analyzed using the normality and homogeneity test and the results showed that the samples were normally distributed and homogeneous. Furthermore, a correlation and regression test was conducted to describe the relationship between contextual approaches and students' critical thinking skills. Based on correlation and regression analysis, the results obtained that the application of the contextual approach has a positive effect with the correlation coefficients of the experimental class and the control class respectively 0.914 and 0.860 and the coefficient of determination is 83.5% and 73.9% respectively. So that the application of a contextual approach has a better effect on students' critical thinking skills compared to conventional learning. Based on the results of the calculation of the test of the difference in the two average mathematical critical thinking skills obtained by tcount = 2.113 > t table = 1.99, then the hypothesis Ho is rejected. So it is concluded that the average increase in critical thinking skills of students who get learning with contextual approaches is higher than students who get conventional learning.

This study aims to determine the effect of the use of agroscience-based Student Worksheets (LKPD) on junior high school students' scientific argumentation skills on ecology and biodiversity. The main problem raised is the low scientific argumentation skills of students, which impacts on suboptimal critical thinking skills and the delivery of opinions based on scientific evidence. The research method used was a quasi-experimental with a nonequivalent control group design, involving two classes, namely the experimental class using agroscience-based LKPD, and the control class using conventional LKPD. The research instrument was a pre-test and post-test essay test that measured three indicators of scientific argumentation, namely claim, evidence, and justification. Data were analyzed using normality tests, homogeneity tests, t-tests, and N-Gain analysis. The results showed a significant difference between the experimental and control classes. The average N-Gain of the experimental class was 0.73 (high category), while the control class was 0.44 (medium category). The largest increase occurred in the justification indicator in the experimental class. The conclusion of this study is that the use of agroscience-based student worksheets (LKPD) is effective in improving students' scientific argumentation skills, particularly in developing logical and evidence-based scientific justifications. It can also serve as an alternative, innovative teaching material to improve the quality of science learning in schools.

This research aims to examine whether the improvement in students' mathematical reasoning abilities who use the Group Investigation learning model is better than the abilities of students who use the Group Investigation learning model. Apart from that, it also reveals the students' attitudes towards the Group Investigation learning model. The method in this research is experimental and research design using pretest and posttest in experimental and control classes. The population in this study were all students in class X OTKP SMKN 1 Cipanas, Cianjur Regency. Samples were taken at random from class, namely from six classes, two classes totaling 32 students were obtained, where class X OTKP 1 was the experimental class and class X OTKP 2 was the control class. The experimental class uses the Group Investigation learning model, while the control class uses conventional learning. Research data was obtained through instruments in the form of pretest and posttest mathematical reasoning abilities, student attitude scales, and observation sheets. Pretest data was processed through a normality test, homogeneity test, and equality of two means test, while posttest data was processed through a normality test, homogeneity test, and difference of two means test using SPSS 16 software. The results showed that the mathematical reasoning abilities of students who used the Group learning model Investigation is better than the ability of students who use conventional learning. Students show an attitude of confidence, self-confidence, actively involve themselves in discussions and are persistent in the Group Investigation learning model.