Microsoft Word - 5. Layout Listiaji 18942-59636-1-Proofread.doc Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 246 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skills of Prospective Science Teachers PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skills of Prospective Science Teachers Prasetyo Listiaji1, Risti Ayu Widianingrum2, Anggita Ayu Ivanda Saputri3, Nor Farahwahidah Abdul Rahman4 1-3Departement of Integrated Science, Universitas Negeri Semarang, Indonesia 4School of Education, Universiti Teknologi Malaysia, Malaysia DOI: 10.23917/ijolae.v4i3.18942 Received: June 30 th , 2022. Revised: July 18 th , 2022. Accepted: August 15 th , 2022 Available Online: September 5 th , 2022. Published Regularly: September 1 st , 2022 Abstract This research aims to analyze the improvement of the critical thinking skills of prospective science teachers after the implementation of smartphone-assisted PjBL and analyze the responses of prospective science teachers to the applied learning model. The research used an experimental model with a Nonequivalent Control Group Design. The research subjects were 2 nd semester Science Education Program students in 2 classes of basic physics courses (experimental and control) as prospective science teachers. Data collection methods were test techniques for measuring critical thinking skills and questionnaire methods for determi- ning student responses. Data analysis methods ware N-Gain analysis, independent sample t-test, and qualita- tive descriptive. The results showed a high increase in critical thinking skills in the experimental class, as indicated by an N-Gain score of 0.71. The results of the hypothesis test also showed that there was a signifi- cant difference between the post-test scores of the experimental and control classes. The PjBL model assis- ted by smartphone sensors also received a very good response from prospective science teacher students. The PjBL model assisted by smartphone sensors can be implemented to improve the critical thinking skills of prospective science teachers and can also be a reference for innovative learning models that align with the demands of technology-based 21 st -century learning. Keywords: applied learning model, critical thinking skills, project-based learning, prospective science teachers, smartphone sensors Corresponding Author: Ptasetyo Listiaji, Department of Integrated Science, Universitas Negeri Semarang, Indonesia Email: p.listiaji@mail.unnes.ac.id 1. Introduction The rapid development of the global world in the 21st-century requires special skills that everyone must be possessed. These skills are known as 21st-century or 4C skills, namely Critical Thinking, Collabora- tion, Communication, and Creativity. These skills are expected to keep pace with global world demand in the future. Teachers as edu- cators are required to be able to give birth to a generation of nations that can compete in the revolutionary era 4.0 (Rahmatullah et al., 2022). One of the 21st-century skills that are very important to be trained by teachers to students is critical thinking. The importance of equipping critical thinking skills is that students are accustomed to facing challenges and solving problems by analyzing their thoughts to decide on a choice and draw con- clusions so that quality graduates are printed and can compete against challenges (Liu et al., 2014). Critical thinking is a way for someone to improve the quality of the results of thinking using systematic techniques, ways of thinking, and generating intellectual Indonesian Journal on Learning and Advanced Education http://journals.ums.ac.id/index.php/ijolae Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 247 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers thinking power in the ideas that are initiated (Lorencova, 2019). According to Alatas (2014), students who have critical thinking skills will have the courage to express ideas, always have curiosity, be flexible, open-minded, honest, careful in making judgments, think, orderly, and sequentially in solving a problem, and never give up in finding optimal results. Therefore, critical thinking skills need to be empowered in the learning process. Mahanal et al. (2019) and Yamin et al. (2021) argue that the ability to think critically cannot arise in learning. Students need to be trained to use their thinking skills in learning so that they not only can memorize but also can think critically. A teacher cannot train criti- cal thinking in his students if he does not have critical thinking skills (Ikhlas et al., 2021). Critical thinking skills can be trained in science learning; therefore, science teach- ers must not only be able to design learning that stimulates critical thinking, but they must also have high critical thinking skills (Demirhan & Koklukaya, 2014). To prepare science teachers to have high thinking, a strategy for preparing Prospective science teachers at the university level is needed. Universities that print Prospective science teachers not only provide knowledge of science content, pedagogy, and technolo- gy but also must present a lecture atmos- phere that can train 21st-century skills. Based on the results of research conducted by Fitri- ani et al. (2018) shows that critical thinking in Prospective science teachers is still rela- tively weak if it is based on The California Critical Thinking Disposition Inventory (CCTDI). However, there are not many stud- ies that discuss how to improve the critical thinking of prospective science teachers. For example, Demiral (2018) research only reached the stage of investigating and meas- uring the critical thinking of prospective sci- ence teachers. Prospective science teachers need to be trained to improve their critical thinking skills by provising lecture activities that can stimulate critical thinking skills. One of the learning models that can be offered is Project Based Learning (PjBL). Goodman and Sti- vers (2010) define PjBL as a teaching ap- proach built on learning activities and real tasks that provide challenges for students related to everyday life to be solved in groups through a project (Bell, 2010; Wurarah et al., 2022). The characteristics of the PjBL model make students face concrete problems, find solutions, and work on pro- jects in teams to overcome these problems (MacLeod & van der Veen, 2020). In the PjBL model, students not only understand the content but also develop skills in students how to play a role in society. Skills devel- oped in PjBL include communication and presentation, organizational and time man- agement, research and inquiry, self- assessment and reflection, group participa- tion and leadership, and critical thinking skills (Kamerikar et al., 2020). Based on these characteristics, PjBL is undoubtedly very suitable to be applied to higher educa- tion learning, especially for the preparation of prospective science teachers. Projects that can be developed in the lec- tures of prospective science teachers are pro- jects in the form of science experiments. Through experimental activities, science teacher candidates can practice their critical thinking skills by solving problems related to the science phenomena being experimented on (Koray & Koksal, 2009). However, ex- perimental activities in universities are still not running optimally because in the new normal era, the learning process still uses the blended concept where some activities are not carried out face-to-face, including practi- Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 248 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers cal activities (Gamage et al., 2020). Experi- mental activities generally use two methods; virtual experiments that use virtual laborato- ries and home experiments. The advantage of home experiments compared to virtual practicums is that students can still do actual experiments at home to train their skills bet- ter. However, home experiments require tools and materials that students need to pre- pare themselves (Kaps et al., 2021). One tool that has the potential to be used in home experiments is a smartphone (Dah- nuss et al., 2021). Smartphones have a varie- ty of sensors such as acceleration sensors, magnetometers, light, sound, gyroscopes, pressure, etc. that can be used as tools when doing science practicum (Dahnuss et al., 2021; Pili & Violanda, 2018; Nuryadin & Hindawan, 2018). Many studies related to the use of smartphone sensors for science experiments have been carried out, such as momentum, oscillation, Atwood experi- ments, circular motion, analysis of com- pound concentrations, and measurement of respiratory rate (Dahnuss et al., 2021; Pili & Violanda, 2018; Nuryadin & Hindawan, 2018). However, these studies only arrived at experimental solutions, not to the stage of examining their effect on the ability of pro- spective science teachers, one of which is critical thinking. Recent reasearch related to the imple- mentation of PjBL to improve critical think- ing skills have been carried out, but with research subjects ranging from elementary school to high school students (Duke et al., 2021; Firda & Sunarti, 2021; Putri et al., 2021), while this research took a state to im- prove the critical thinking skills of prospec- tive science teachers. In addition, the recent PjBL implementation has not integrated much information technology in line with 21st century learning, such as the research of Baran et al. (2021) and Syukri et al. (2021) who used STEM-based PjBL. The imple- mentation of PjBL in this study has distinc- tion by integrating technology in experi- mental activities assisted by smartphone sen- sors. The use of smartphone sensors has the potential to be used in PjBL. Students who are prospective science teachers can be as- signed simple project assignments regarding science experiments using smartphone sen- sors. Experiments can be done independently and easily at home. Through the PjBL model assisted by smartphone sensors, prospective science teacher students can train themselves to solve a practical science problem, design, and create a project to solve these problems, which of course, is possible to improve their critical thinking. Based on the potential of using PjBL assisted by smartphone sensors and the absence of research related to im- proving the critical thinking of prospective science teachers, it is necessary to conduct research on the implementation of PjBL as- sisted by smartphone sensors to improve the critical thinking skills of prospective science teachers. This research has two objectives; to analyze the improvement of the critical thinking skills of prospective science teach- ers after the implementation of smartphone assisted PjBL in science education lectures and to analyze the responses of prospective science teachers to the applied learning mod- el. 2. Method The research used was quantitative re- search, namely experimental research with a Nonequivalent Control Group Design. The research design was stated by Table 1. O1 was the pre-test in the experimental class, O2 was the post-test in the experimental class, O3 was the pre-test in the control class, O4 was the post-test in the control class, X was the treatment given to the experimental class, using a PjBL model assisted by smartphone Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 249 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers sensor, Y was the treatment given to the con- trol class, namely the direct instruction mo- del assisted by a virtual laboratory. The research was conducted at the Sci- ence Education Study Program, Universitas Negeri Semarang in the Even Semester of 2021/2022. The research subjects used were 2nd semester students who took basic physics courses selected in 2 classes (experimental and control). Each class consists of 25 pros- pective science teacher students. Data collection methods were in the form of test methods and questionnaire me- thods. The test was used to measure the criti- cal thinking skills of prospective science teachers. The questionnaire method was used to determine student responses to the lectu- res. Based on the data collection method used, this study used two instruments; test questions (pre-test and post-test) and student response questionnaire sheets. The test ques- tions consisted of 15 essays adjusted to the indicators of critical thinking skills and cog- nitive level shown by the grid of questions in table 2. Table 1. Research design Table 2. Grid of Pre-Test and Post-Test Questions Note: CTS is code for critical thinking skill indicators, C1 (remembering), C2 (understanding), C3 (applying), C4 (analyzing), C5 (evaluating), and C6 (creating). To determine the effect of PjBL model assisted by smartphone sensors to improve critical thinking skills, two data analysis methods were carried out. The data analysis were N-Gain analysis and hypothesis testing with independent sample t-test. The results of the N-Gain analysis were compared with the categories obtained by the G values (Ta- ble 3). Meanwhile, the results of the t-test cal- culation were compared with the t table value at a confidence level of 0.05 with dk = 50 – 2 = 48, so that the t table = 1.677 is obtained. The design of the hypothesis is shown in Table 4. Then, to analyze the response data of prospective science teacher students to lec- tures, a qualitative descriptive analysis was used from the results of the completed re- sponse questionnaire. Group Pre-test Treatment Post-test Experiment O1 X O2 Control O3 Y O4 Code of Indicator Indicators of critical thinking ability (Ennis, 1996). Number of questions Cognitive Level C1 C2 C3 C4 C5 C6 CTS 1 Able to formulate the main points of the problem 3 √ CTS 2 Able to reveal the facts needed to slove a problem 3 √ CTS 3 Able to choose logical, relevant, and accu- rate arguments 3 √ CTS 4 Able to detect bias based on different point of view 3 √ CTS 5 Able to formulate the consequences of a statement taken as a decision 3 √ Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 250 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers Table 3. G Value Categorization Interval (G) Gain (G) ≥ 0,7 High 0,3 ≤ (G) ≤ 0,7 Medium 0,3 ≥ (G) Low Table 4. Hypothesis Design Hypothesis Information Terms Accepted Ho The average results of critical thinking skills in the experi- mental class were the same as in the control class t count < t table Ha The average result of critical thinking skills in the experi- mental class were greater than in the control class. t count > t table 3. Result and Discussion a. Improvement of the Critical Thinking Skills The results of the average pre-test and post-test scores in the experimental and con- trol groups are shown in Table 5. Based on Table 5, the N-Gain score in the experi- mental group was in the high category, while the N-Gain score in the control group was in the medium category. There was an im- provemen of critical thinking skills in the experimental and control class, but the im- provement in the experiment class was high- er. Based on these data, the PjBL model as- sisted by smartphone sensors has a positively impact on critical thinking improvement skills of prospective science teachers. To find out how the impact of each critical thinking skills indicator is presented, the average pre-test and post-test scores that have been divided for each indicator (Table 6). N-Gain for each indicator is shown in Figure 1. Based on table 6 and Figure 1, the ex- perimental class obtained an improvement in critical thinking skills higher than the control class. In the experimental class the N-Gain value ranges from 0.62 to 0.72 in the medi- um and high categories, while in the control class the N-Gain value is in the range 0.32 to 0.58. In the experimental class N-Gain for indicators CTS 1, CTS 2, and CTS 3 ob- tained the medium category. In the CTS 1, CTS 2, and CTS 3 indicators, prospective science teacher students obtained higher pre- test scores than those in CTS 4 and 5. This was because in CTS 1 to CTS 3 students were assisted by the knowledge previously acquired in secondary school education. For example, in CTS 1, which is to formulate the main problems of Physics, this indicator is that students have been trained during sec- ondary school education. Table 5. The Results of Critical Thinking Skills in the Experimental and Control Group Group Pre-test Post-test N-Gain (G) Experiment 55.28 86.56 0.71 Control 56.73 76.42 0.46 Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 251 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers Table 6. Pre-Test and Post-Test Results for Each Critical Thinking Skill Indicators Group Indicators Pre-test Post-test Experiment CTS 1 68.61 88.12 CTS 2 60.85 88.06 CTS 3 49.71 84.28 CTS 4 55.30 87.25 CTS 5 41.95 85.08 Control CTS 1 66.73 77,60 CTS 2 62.32 75,26 CTS 3 51.14 73,25 CTS 4 56.68 78,16 CTS 5 46.78 77,83 Figure 1. N-Gain for Each Critical Thinking Skill Indicator Meanwhile, CTS 4 and CTS 5 obtained N-Gain in the high category. The PjBL mod- el trains students to detect bias in different perspectives (CTS 4) through one of the learning experience evaluation syntaxes (Sasson et al., 2018). Through the evaluation of learning experiences, each prospective science teacher presents a project report, other students provide feedback, and con- clude the project results together with the lecturer (Dimmitt, 2017). This learning syn- tax will expand knowledge from various points of view so that it will be able to detect biases that occur when developing projects. PjBL assisted by smartphone sensors, can also train students to formulate the conse- quences of a statement taken as a decision (CTS 5). CTS 5 was obtained by students when conducting an experiment to make a simple basic physics project. In this activity, stu- dents choose the suitable smartphone sensor to use so that for each sensor selection, stu- dents can formulate the consequences of the data obtained. Each sensor on a smartphone has a different level of accuracy and preci- sion so that students can analyze the conse- quences of the data from the project experi- ments that have been carried out. This activi- ty is carried out in one of the PjBL syntaxes, 0,62 0,69 0,69 0,71 0,74 0,32 0,34 0,45 0,49 0,58 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 CTS 1 CTS 2 CTS 3 CTS 4 CTS 5 N -G ai n (G ) Experiment Control Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 252 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers namely developing projects. In this learning syntax, students do projects according to a schedule, record each stage, and discuss problems that arise during project comple- tion with the lecturer (Kokotsaki, 2016). In the control class, The improvement of critical thinking skills for each indicator is the medium category. This shows that learn- ing using direct instruction assisted by virtu- al laboratories can also improve critical thinking skills but not significantly. This is because, the direct instruction model do not have learning syntax that focuses to improve critical thinking skills (Yeh, 2009). In the use of virtual laboratories, prospective science teacher students are also not trained to do acrtual experiments, so that the data obtained are ideal. This makes it difficult for students to analyze the problems that occur when ex- periments are carried out, students also can- not analyze errors that occured from various points of view when conducting experiments (Santyasa et al., 2019). The learning experi- ence is also lacking because students do not practice the science experiment directly (Oldov et al,, 2012). In order to test the significance of the in- fluence of the PjBL model assisted by smartphone sensors on improving critical thinking skills, a hypothesis test was carried out using an independent sample t-test. The scores compared are the post-test scores of the experimental and control classes. The t- test was used because the post-test scores in the experimental and control classes were normally distributed from the results of the normality test. The results of the t-test using SPSS are shown in table 7. Based on the results of the t-test analy- sis, it shows that t count = 4,873 or greater than t table, so that the alternative hypothesis (Ha) is accepted or indicates that there is a significant difference between the scores of critical thinking skills in the experimental class and in the control class. The score of critical thinking skills in the experimental class is higher than in the control class, so that the results of this hypothesis test are in line with the N-Gain analysis. In project- based learning, prospective science teacher students are trained to formulate projects from the esensial question stage, design pro- jects, develop schedules, create projects, monitor projects, test results, and evaluate learning experiences. At the esensial ques- tion stage, prospective science teacher stu- dents practice formulating problem points (CTS 1) (Hofstein & Kind, 2012), when de- signing projects, students are also trained to reveal the facts needed in solving a problem choosing logical, relevant, and accurate ar- guments in designing projects (CTS 3 and CTS 4) (Cortazar et al., 2021). In project monitoring activities, testing results, and evaluating learning experiences, students are trained to detect bias based on different points of view from teachers and other stu- dents (CTS 4) and to formulate consequenc- es of a step taken when developing a project (CTS 5). The consequence in question is the selection of the smartphone sensor used. This allows students to analyze how it impacts the project results. Another advantage of using smartphone sensors in experimental projects is that students can do it easily and attrac- tively. Student interest in learning will also support the improvement of critical thinking skills (Nelson & Crow, 2014). The results of experimental projects using smartphone sen- sors will be more accurate. Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 253 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers Table 7. T-Test Eesult Using SPSS Levene's Test for Equality of Variances t-test for Equality of Means F Sig. t df Sig. (2- tailed) Mean Difference Std. Error Difference 95% Confidence Interval of the Difference Lower Upper Skor Equal variances assumed 1.936 .171 4.873 48 .000 10.160 2.085 5.968 14.352 Equal variances not assumed 4.873 45.558 .000 10.160 2.085 5.962 14.358 b. Responses of Prospective Science Teachers The responses of prospective science teacher students to PjBL model assisted by smartphone sensors were analyzed using a Linkert scale with a rating of 1 to 5. The re- sults of student responses to learning are shown in Figure 2. The PjBL model assisted by smartphone sensors received a very good rating on attractiveness and fun, understand- ing of the material, practicality, and useful- ness for prospective science teachers. In the attractiveness and fun aspect, students feel enthusiastic and interested in the learning model because it makes the development of challenging projects (Chiang & Lee, 2016). Students also feel that they understand the material better because the project is carried out as an experiment, so concrete knowledge can be obtained from the experimental re- sults (Husnaini & Chen, 2019). The use of sensors on smartphones as a tool for science experiment projects is also considered prac- tical because it can be done easily, and stu- dents can repeat it independently at home with their smartphone (Pili & Violanda, 2018). The application of a project-based learning model assisted by smartphone sen- sors is also helpful for prospective science teachers because it can provide for future learning references that align with technolo- gy-based 21st-century learning. Indonesian Journal on Learning and Advanced Education (IJOLAE)| p-ISSN 2655-920x, e-ISSN 2656-2804 Vol. 4 (3) (2022) 246-256 254 PjBL Model assisted by Smartphone Sensors to Improve Critical Thinking Skill of Prospective Science Teachers Figure 2. Responses of Prospective Science Teacher Student 4. Conclusion The implementation of a PjBL model as- sisted by smartphone sensors can improve the thinking skills of prospective science teacher students as indicated by an improve- ment of critical thinking skills in the experi- mental class, obtaining an N-Gain score of 0.71 or high category. The hypothesis test result also showed a significant difference between the scores of critical thinking skills in the experimental and control classes. 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