homogeneity test
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Author(s):  
Yessi Febriani ◽  
Sudewi Sudewi ◽  
Rosanna Sembiring

Tamarillo (Solanum betaceum Cav.) is a plant that is spread in Java, Bali and North Sumatra, which is rich in nutrients and contain flavonoid as antioxidants that can prevent cell damage due to oxidative stress. Clay-based face masks have a firming and cleansing effect on the skin. Tamarillo was extracted by maceration method using 96% ethanol extract, phytochemical screening was carried out. Clay mask formulation with extract concentration of 1.5%, 2%, 2.5% and blanks. Physical quality test of clay mask preparations included homogeneity test, stability test, pH test, dry time test, irritation test, effectiveness test of clay mask preparation on volunteers using the Skin Analyzer Checkher (Aram), preference test and antioxidant test using the DPPH method. The results showed that the ethanol extract tamarillo contained alkaloids, flavonoids, saponins and could be formulated into a clay mask preparation that was homogeneous, stable, met the pH requirements, and dried time. The results of the effectiveness test using a checkher skin analyzer give the effect of reducing blemishes, reducing pores, moisturizing, not causing irritation to the skin. The antioxidant activity of the ethanol extract tamarillo were in the moderate category with an IC50 value of 201 g/mL and the clay mask preparation of the ethanol extract tamarillo with a concentration of 2.5% was in the medium category with an IC50 value of 221 g/mL.


2021 ◽  
Vol 9 (4) ◽  
pp. 360-372
Author(s):  
Yovi Imeysa ◽  
Farida Farida ◽  
Suherman Suherman ◽  
Tia Agnesa

This study aimed to determine the effect of the STEM (Science, Technology, Engineering, and Mathematics) learning approach on the ability to understand mathematical concepts in terms of students' Al-Qur'an literacy. This research is a Quasy Experimental Design research with a 2×3 factorial research design. The data collection techniques in this study were in the form of a concept understanding test and an Al-Qur'an literacy questionnaire. The data analysis technique used is the normality test and homogeneity test, and the Two-way ANOVA test. Based on the results of the study, it was concluded that there was an effect of the STEM learning approach (Science, Technology, Engineering, and Mathematics) on the ability to understand students' mathematical concepts in the material of Building Flat Side Space. There is no influence of Al-Qur'an literacy on the ability to understand students' mathematical concepts in the material of Constructing Flat Sided Space. There is no interaction between the treatment of the STEM learning approach (Science, Technology, Engineering, and Mathematics) with the Al-Qur'an literacy category on the ability to understand mathematical concepts in the matter of Constructing Flat Sided Space.


2021 ◽  
Vol 20 (4) ◽  
pp. 813-833
Author(s):  
Muhammed Veysel Kaya ◽  
Suat Serhat Yilmaz ◽  
Mehmet Gökhan Özdemir

Motivation: Humanity has benefited from natural resources in production activities throughout history and this pressure on natural resources has increased even more with the efforts of industrialization. In this process, people benefited heavily from fossil fuels in their production and distribution activities, thereby damaging the environment and the atmosphere to a large extent. With the destruction of the environment, it has become important for the countries and the academic circles to measure environmental damage with the increase of economic activities in order to take various measures. Aim: At this point, in this study, the relationship between economic growth and carbon-dioxide emissions was examined within the scope of 50 countries that are members of the Organization of Islamic Cooperation (OIC). In this process, annual data of the countries concerned between 1995 and 2017 were used; Pedroni Cointegration Analysis, Granger Causality Analysis, Pooled Mean Group Estimator (PMGE) and Mean Group Estimator (MGE) methods were used to measure and estimate the relationship between these two variables. The causality analysis shows that the economic growth is the Granger cause of carbon-dioxide emissions in the country group studied. In addition, the coefficients obtained in PMGE and MGE analyzes were found as 0.43 and 0.33 and were statistically significant and positive. Then, with the help of Hausman Homogeneity Test, it was decided between the two estimators, and it concluded that PMGE Estimator is the more reliable estimator. Results: The results obtained with the PMGE estimator indicate that the 1% increase in economic growth increased carbon dioxide emission by 0.43%.


2021 ◽  
Vol 1 (4) ◽  
pp. 590-596
Author(s):  
Ika Kurniawati ◽  
Laila Hayati ◽  
Nurul Hikmah ◽  
Nyoman Sridana

This research is a quasi-experimental study that aims to determine the effect of the Group Investigation (GI) type of cooperative learning model on the mathematics learning outcomes of junior high school students. The population in this study were all VIII grade students of SMP Negeri 2 Kediri, which were divided into three classes. The research sample of two classes was taken by the purposive sampling technique. The data collection technique using tests and observation sheets. The experimental class uses a Group Investigation (GI) type of cooperative learning model and the control class uses a direct learning model. The sample in the study was class VIII-A as the experimental class and class VIIIB as the control class. The normality test and homogeneity test showed that the two samples were normally distributed and homogeneous. The data analysis using t test with  show  and  so  is rejected. So it can be concluded that there is an effect of the Group Investigation (GI) type of cooperative learning model on students mathematics learning outcomes. To find out how much the effect of the Group Investigation (GI) type of cooperative learning model has on the students mathematics learning outcomes, it can be done by using effect size calculations with Cohen’s formula and the calculation results are 1.18 including in the high category. This means that the application of the Group Investigation (GI) type of cooperative learning model has a high effect on the mathematics learning outcomes of VIII grade students of SMP Negeri 2 kediri academic year 2021/2022


2021 ◽  
Vol 4 (2) ◽  
pp. 215-227
Author(s):  
Elly Susanti ◽  
Nelly Ervina ◽  
Ernest Grace ◽  
Sudung Simatupang

In doing investment, an investor certainly avoids risk; thus, the investor needs a model in making predictions to forecast the return of shares. There are two models to predict this: Capital Asset Pricing Capital (CAPM) and Arbitrage Pricing Theory (APT). The purpose of this study is to find out which models are more accurate in determining investment options, especially during the Covid-19 pandemic in companies that are included in the LQ 45 Index group. The population in this study is 50 companies listed in LQ 45 from February 2020 - July 2021. The sampling technique used in this study is purposive sampling. The data used in this study will be processed through Ms.Excel and SPSS Version 21. The data analysis techniques used in this study are the Basic Assumption Test consisting of Normality Test and Homogeneity Test, Mean Absolute Deviation (MAD), and hypothesis testing consisting of independent t-test samples. The results in this study show that Model is accurate in predicting stock returns in the Covid-19 pandemic is a CAPM model this is because the value of MAD CAPM is smaller than mad APT. Furthermore, independent t-test samples showed that H0 was rejected which meant that there was a difference in accuracy between CAPM and APT in calculating the return of LQ 45 shares. The implication of this study are expected to provide references to investors and potential investors as a source of information in decision making to make investments in this pandemic period.


KOVALEN ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 178-185
Author(s):  
Gatut Ari Wardani ◽  
Lilis Tuslinah ◽  
Eva Saefatuzzahro ◽  
Indra

Acrylamide levels in Arabica coffee at various roasting temperatures have been determined. Coffee beans are roasted at 160°C, 180°C, and 210°C for 8 minutes. Analysis was carried out using High-Performance Liquid Chromatography (HPLC) with C-18 reversed-phase, mobile phase using methanol and 0.1% phosphoric acid solution (5:95), flow rate 1 mL/min, UV-Vis detector 198 nm wavelength. Acrylamide levels in Arabica coffee are 160°C of 14.665 ppm, 180°C of 15.973 ppm, and 210°C of 18.501 ppm. Based on the results of the acrylamide content in Arabica coffee, the higher the roasting temperature, the greater the acrylamide content. ANOVA test regarding the normality test sig value of 0.637, 0.463, and 0.637 normally distributed. Based on the homogeneity test, it was found that the variation between groups was the same or homogeneous. The results of the ANOVA test stated that there were differences in the acrylamide levels of Arabica coffee in the roasting temperature difference group and the results of the post hoc Bonferroni test found that the average differences in the roasting temperature of Arabica coffee were significantly different 160°C-180°C and 160°C-210°C.


2021 ◽  
Vol 5 (2) ◽  
pp. 117-129
Author(s):  
Rohani Rohani ◽  
Syafruddin Yusuf ◽  
Syarifuddin Syarifuddin

The purpose of this study was to determine the effect of the team-assisted individualization model on the social skills of students in the historical subjects in Senior High School Palembang. The type of method used in this study is quasi-experimental. Class XI IPA 3 as an experimental class using random sampling. Data collection techniques used in this study are using questionnaire and observation, data analysis techniques used data homogeneity test, data linearity test, and simple regression test with significant level Fhitung ˃ Ftabel with real level (α = 0,05). The result of Fhitung obtained is 5,40 while to find Ftabel that is db = 1 as the numerator and db = 34 as the denominator and consulted to table F is obtained 4,13. Statistical calculations have obtained the results Fhitung ˃ Ftabel (5,40 ˃ 4,13) that means there was the influence of team assisted individualization model on the social skills of students in the historical subjects in Senior High School Palembang. Tujuan penelitian ini adalah untuk mengetahui apakah ada pengaruh model pembelajaran team assisted individualization terhadap keterampilan sosial peserta didik pada mata pelajaran sejarah Sekolah Menengah Atas Palembang. Metode penelitian yang digunakan quasi eksperimen. Kelas XI IPA 3 sebagai kelas eksperimen dengan menggunakan teknik random sampling. Teknik pengumpulan data dalam penelitian ini yakni dengan menggunakan angket dan observasi. Teknik uji prasyarat analisis data yang digunakan adalah uji homogenitas data, uji linearitas data, dan uji regresi sederhana dengan taraf signifikan Fhitung ˃ Ftabel dan taraf α = 0,05. Hasil Fhitung didapat 5,40 sementara untuk mencari Ftabel yakni db = 1 sebagai pembilang dan db = 34 sebagai penyebut dan di konsultasikan ke tabel F didapat 4,13. Perhitungan statistik diperoleh hasil Fhitung˃ Ftabel (5,40 ˃ 4,13) yang artinya terdapat pengaruh model pembelajaran team assisted individualization terhadap keterampilan sosial peserta didik pada mata pelajaran sejarah di Sekolah Menengah Atas Palembang.


2021 ◽  
Vol 3 (12) ◽  
pp. 952-960
Author(s):  
Annisa Cikal Maharani Nuhanafia ◽  
Siti Nurrochmah

Abstract: The Covid-19 pandemic, which has attacked in all countries, especially in Indonesia in 2020, has changed the learning methods at education levels of education in Indonesia, especially learning for elementary school (SD) to college or University levels. This study examines the value of learning achievement of students of the PJKR FIK study program, State University of Malang. The purpose of this study was to determine and assess whether there was a significant difference in the learning achievement scores of the 2017 Off A class of student theory and practice between the 2018/2019 and even 2019/2020 semesters in the PJKR FIK study program, State University of Malang. This research is included in the ex post facto study using a causal comparative design. The sample of this study was 37 students of the PJKR offering A class of 2017. Data analysis in this study used the Kolmogorov-Smirnov normality test technique, the homogeneity test (Ftest), and the difference test in the form of an unrelated sample t test. Based on the data analysis, the result obtained by the coefficient Tcount greater than or equal to Ttable at a significant level of 0,05, meaning that H₀ is rejected and H₁ is accepted. This means that there is a significant difference in the learning achievement values of the theory and practice subject in the 2018/2019 and even 2019/2020 semesters in the 2017 A class Offering students of the PJKR FIK study Program, State University of Malang. Abstrak: Pandemi Covid-19 yang menyerang di semua negara khususnya di negara Indonesia pada tahun 2020 ini, merubah metode pembelajaran pada jenjang pendidikan yang ada di Indonesia khususnya pembelajaran dari jenjang Sekolah Dasar (SD) sampai ke jenjang Perguruan Tinggi atau Universitas. Penelitian ini mengkaji nilai prestasi belajar mahasiswa program studi PJKR FIK Universitas Negeri Malang. Tujuan dari penelitian ini adalah untuk mengetahui dan mengkaji ada tidaknya perbedaan yang signifikan nilai prestasi belajar mata kuliah teori dan praktek mahasiswa angkatan 2017 Off A antara semester genap 2018/2019 dan genap 2019/2020 pada prodi PJKR FIK Universitas Negeri Malang. Penelitian ini termasuk dalam penelitian expost facto dengan menggunakan rancangan causal comparative. Sampel penelitian ini berjumlah 37 mahasiswa Prodi PJKR offering A angkatan tahun 2017. Analisis data pada penelitian ini menggunakan teknik uji normalitas Kolmogorov-smirnov, uji homogenitas (uji F), dan uji beda dalam bentuk uji t sampel berhubungan. Berdasarkan analisis data diperoleh hasil koefisien Thitung lebih besar sama dengan Ttabel pada taraf signifikan 0,05, artinya bahwa H₀ ditolak dan H₁ diterima. Artinya, ada perbedaan yang signifikan hasil prestasi belajar antara semester genap 2018/2019 (sebelum pandemi Covid-19) dengan semester genap 2019/2020 (sebelum dan saat pandemi Covid-19) pada mahasiswa offering A angkatan 2017 program studi PJKR FIK Universitas Negeri Malang.


2021 ◽  
Author(s):  
Juna Probha Devi ◽  
Chandan Mahanta ◽  
Anamika Barua

Abstract This study is aimed at studying long–term historical and future (1950-2099) trends for the RCP 4.5 and RCP 8.5 on approximately 30-year timescale at annual and seasonal for precipitation and at annual, seasonal, monthly, and diurnal temperature range (DTR) for temperature maximum (T_max), temperature minimum (T_min) variations using statistical trend analysis techniques– Mann–Kendall test (MK) and Sen's slope estimator (S) and the homogeneity test using Pettitt’s test. The study is carried out in three spatial points across the Tawang Chu in the district of Tawang, Arunachal Pradesh. The summer mean precipitation for RCP 4.5 (2006-2065) shows a positive trend with a rise in precipitation between 1.56 mm to 9.94 mm in all the study points. The mean annual precipitation statistics for all the points show an increase of RCP 4.5 in 2006-2052 and 2053-2099 timescale. Both RCP 4.5 and 8.5 scenarios exhibit a uniform rise in T_min and T_max during investigation. For all the points, the results likewise reveal a rising trend in mean annual T_min and T_max. Still, the inter-decadal temperature statistical analysis shows that the increase in mean annual T_min is greater than the increase in T_max, indicating a decreasing trend in DTR. It is anticipated that this study's outcomes will contribute to a better understanding of the relationship between change in climate and the regional hydrological behaviour and will be benefitting the society to develop a regional strategy for water resource management, can serve as a resource for climate impact research scope- assessments, adaptation, mitigation, and disaster management strategies for India's north-eastern region.


Author(s):  
Monica Ivana Putri ◽  
Wedra Aprison ◽  
Fadhilla Yusri

<em><span lang="EN-US">The purpose of this study is that researchers want to see how much an increase in student entrepreneurial interest in SMK 1 Kec. Guguak through basic services in the field of career guidance. The population is all grade XII students of SMKN 1 Kec. Guguak, amounting to 236 people, while the research sample were students of class XII multimedia 2, amounting to 20 people. Which is indicated to have low student entrepreneurial interest based on a purposive sampling technique. The data collection instrument is a Likert scale. Data analysis techniques using, normality test, homogeneity test, and hypothesis testing using Statistical Product and Service Solution (SPSS) version 22. The results of research that have been done there are differences between the pretest value and the posttest value. From the results of statistical tests it is known that tcount 4,737&gt; from ttable 1,729 with df 19 at a significance level of 0.05, it can be said that Ha is accepted meaning that there is an increase in student entrepreneurial interest for pretest and posttest through basic services in career guidance.</span></em>


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