Pengaruh Model Pembelajaran Project Based Learning (PjBL) terhadap Hasil dan Aktivitas Belajar Siswa pada Materi Pencemaran Lingkungan di Kelas X MIA SMAN 6 Binjai TP 2018-2019

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran Project Based Learning terhadap hasil dan aktivitas belajar siswa pada materi pokok pencemaran lingkungan kelas X MIA SMAN 6 Binjai TP 2018-2019. Penelitian ini merupakan penelitian eksperimen dimana populasinya adalah seluruh siswa kelas X MIA, Pengambilan sampel penelitian dilakukan secara acak (Random sampling). Dua kelas sebagai sampel yaitu kelas X MIA 1 sebagai kelas eksperimen yang diajar menggunakan model pembelajaran Project Based Learning dan XI MIA 2 sebagai kelas kontrol yang diajar menggunakan problem based learning. Kelas eksperimen berjumlah 35 orang dan kelas kontrol berjumlah 29 orang, sehingga jumlah keseluruhan sebanyak 62 orang. Rata–rata hasil belajar kelas eksperimen sebesar 82,43 dan kelas kontrol 75,69. Uji hipotesis menunjukkan bahwa perhitungan thitung ≥ ttabel (3,404 ≥ 1,999) yang berarti Ha diterima dan H0 ditolak. Maka, disimpulkan bahwa ada pengaruh hasil belajar siswa yang diajarkan dengan model pembelajaran Project Based Learning (PjBL). Untuk perhitungan aktivitas belajar siswa diperoleh rata-rata nilai aktivitas belajar siswa pada kelas eksperimen (89) lebih tinggi dibanding niali rata-rata kelas kontrol (65,4). Uji hipotesis menunjukkan thitung ≥ ttabel (3,48 ≥ 1,99), maka dinyatakan H0ditolak dan Haditerima. Dengan demikian ada pengaruh model pembelajaran Project Based Learning terhadap aktivitas belajar siswa. Maka dari itu, dapat dapat disimpulkan bahwa ada pengaruh model pembelajaran Project Based Learning terhadap hasil dan aktivitas belajar siswa pada materi pencemaran lingkungan di kelas X MIA SMAN 6 Binjai TP 2018-2019

Pengaruh Current Ratio, Debt to Equity Ratio Dan Net Profit Margin Terhadap Dividend Payout Ratio Pada Perusahaan Dasar Dan Kimia Yang Terdaftar Di Bei Periode 2015-2019

The purpose of this study is to investigate and analyze the influence of current ratio, debt ratio and net asset ratio on the dividend payout ratio of enterprises of all industries and business sectors. business. Basic. 2019. The research method used in this study is the quantitative method. The population of this survey is 72 out of all industrial companies listed on the Stock Exchange of Indonesia (BEI). Thirteen companies were selected using objective mining from this pool. The analytical method used in this study is multiple regression analysis. In this study, it was found that the current ratio has no great influence on the dividend ratio, but the debt ratio has a large negative effect. It has a great impact on the dividend payout ratio of the listed chemical industry and the core industry. From 2015 to 2019 on the Indonesian Stock Exchange. According to the results of the competition, the current ratio, debt ratio and net profit margin have a significant impact on the dividend payment rates of major chemical and industrial companies listed on the stock exchange

The global prevalence and association between the risk of myocarditis and mRNA-based COVID-19 vaccination: A network meta-analysis version 1; peer review: awaiting peer review

Background: Cases of myocarditis development have been reported after administration of messenger ribonucleic acid (mRNA)-based coronavirus disease (COVID-19) vaccines. However, the reports vary among the studies, and the types of mRNA vaccines with potential to cause myocarditis remain unidentified. The objective was to assess the cumulative prevalence of myocarditis and determine the association between myocarditis and mRNA-based COVID-19 vaccination. Methods: We performed a network meta-analysis by searching articles in PubMed, Scopus, and Web of Science. Information on the prevalence of myocarditis after the mRNA-based COVID-19 vaccination was collected from each study. Analysis was performed by calculating the pooled prevalence rate, and the association was determined using the Z-test. Data networking was performed using the Bayesian method. Results: A total of 18 papers was included in our analysis. We found that the cumulative prevalence of myocarditis was 1.7, 1.9, 1.2, and 1.1 per 100,000 population after vaccination with different types of mRNA-based COVID-19 vaccines, namely all mRNA COVID-19 vaccines, BNT162b1, mRNA-1273, and the combination of BNT162b1 and mRNA-1273, respectively. Moreover, the results revealed that BNT162b1 vaccination increased the risk of myocarditis by 1.64- and 1.71-folds compared to mRNA-1273 and the combination of BNT162b2 and mRNA-1273, respectively. Similar risks of developing myocarditis were observed after mRNA-1273 and the combination of BNT162b1 and mRNA-1273 vaccination. Conclusions: Our findings suggest the cumulative prevalence of myocarditis after mRNA-based COVID-19 vaccination with maximum prevalence was observed after BNT162b2 administration. BNT162b2 was associated with a higher risk of developing myocarditis than the other mRNA-based COVID-19 vaccines