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All Journal Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Journal of Education, Humaniora and Social Sciences (JEHSS) BIOLOVA International Journal of Social Science, Educational, Economics, Agriculture Research, and Technology (IJSET) JAKBS Jurnal Ilmiah Multidisiplin Ilmu
Riski Rahmadani
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Computer Science & IT Economics, Econometrics & Finance Education Health Professions Mathematics Public Health Social Sciences Other

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PENAKSIR RASIO UNTUK RATA-RATA POPULASI PADA SAMPLING ACAK SEDERHANA MENGGUNAKAN KOEFISIEN VARIASI DAN MEDIAN Riski Rahmadani; Arisman Adnan; Haposan Sirait
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 1 (2014): Wisuda Februari 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

This paper discusses three ratio estimators for the population mean in simple randomsampling using coefficient of variation and median of an auxiliary variable, which is areview from the article of Subramani and Kumarapandiyan. All estimators are biased,then their mean square errors (MSE) are determined. Furthermore, the mean squareerrors are compared to show which estimator is the most efficient estimator. This paperreveals that the estimator using coefficient of variation and the median has the smallestmean square error (MSE).
KEEFEKTIFAN MODEL DISCOVERY LEARNING DENGAN TEAM ASSISTED INDIVIDUALIZATION (D-TAI) TERHADAP KETERAMPILAN BERPIKIR KRITIS PESERTA DIDIK SMA Rusmalinda, Riski; Rahmadani, Riski
BIOLOVA Vol. 3 No. 2 (2022): Volume 3 Nomor 2 Agustus 2022
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/biolova.v3i2.2528

Abstract

Abstrak Keterampilan berpikir kritis dapat dikembangkan melalui proses pembelajaran yang ideal. Alternatif model pembelajaran yang diduga potensial untuk mengembangkan keterampilan berikir kritis peserta didik adalah model pembelajaran Discovery Learning dengan Team Assisted Individualization (D-TAI). Penelitian ini bertujuan untuk mengetahui keefektifan model Discovery Learning dengan Team Assisted Individualization (D-TAI) terhadap keterampilan berpikir kritis peserta didik kelas X materi perubahan lingkungan. Jenis penelitian ini adalah quasy experiment menggunakan desain pretest posttest control group design. Penelitian dilakukan di SMAN 2 Metro. Populasi dalam penelitian ini adalah seluruh peserta didik di SMAN 2 Metro kelas X semester genap yang berjumlah 192. Sampel dalam penelitian ini adalah seluruh peserta didik kelas X IPA 1 dan kelas X IPA 6 yang berjumlah 62 peserta didik. Sampel diambil menggunakan tehnik clustered random sampling. Instrumen pengumpulan data adalah tes berupa soal uraian berjumlah 10 item soal. Teknik analisis data yang digunakan adalah uji independent sampel t-test dan uji N-Gain.Hasil penelitian menunjukkan bahwa penerapan model pembelajaran D-TAI efektif terhadap peningkatan keterampilan berpikir kritis peserta didik. Hal ini ditunjukkan dari nilai sigifikan (p<0,05) yang artinya terdapat perbedaan signifikan. Kata kunci: discovery learning, team assisted individualization (D-TAI), keterampilan berpikir kritis. Abstrak :Critical thinking skills can be developed through an ideal learning process. An alternative learning model that is thought to have the potential to develop students' critical thinking skills is the Discovery Learning learning model with Team Assisted Individualization (D-TAI). This study aims to determine the effectiveness of the Discovery Learning model with Team Assisted Individualization (D-TAI) on the critical thinking skills of class X students regarding environmental change. This type of research is a quasi experiment using a pretest posttest control group design. The research was conducted at SMAN 2 Metro. The population in this study were all students in SMAN 2 Metro class X even semesters totaling 192. The samples in this study were all students in class X IPA 1 and class X IPA 6, totaling 62 students. Samples were taken using clustered random sampling technique. The data collection instrument was a test in the form of a description of 10 items. The data analysis technique used was the independent sample t-test and the N-Gain test. The results showed that the application of the D-TAI learning model was effective in improving students' critical thinking skills. This is indicated by the significadnt value (p<0.05), which means that there is a significant difference. Keywords: discovery learning, team assisted individualization (D-TAI), critical thinking skills.
Fenomena Kenakalan Remaja Pada Aktivitas Geng Motor di desa Melati Ii Kecamatan Perbaungan Rahmadani, Riski; Jailani, Muhammad
Journal of Education, Humaniora and Social Sciences (JEHSS) Vol 7, No 1 (2024): Journal of Education, Humaniora and Social Sciences (JEHSS), August
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jehss.v7i1.2305

Abstract

This study aims to describe and analyze the phenomenon of juvenile delinquency in motorcycle gang activities in Melati II Village, Perbaungan District. This study uses a qualitative research method with a phenomenological approach. Data collection techniques used in this study through observation, interviews, and documentation. The results of the study indicate that the phenomenon of juvenile delinquency in motorcycle gang activities in Melati II Village, Perbaungan District is related to internal and external factors of adolescents. Internal factors include the desire to be recognized, self-identity, and the search for identity. External factors include the influence of the family environment, social circles, and lack of youth infrastructure. Forms of juvenile delinquency carried out by motorcycle gang members include illegal racing, brawls, drinking alcohol, and drug abuse. The impact of these motorcycle gang activities has disturbed the community and has the potential to cause security disturbances, so that many people submit complaints to the village government to request efforts from the village. Efforts made to overcome this problem are through fostering and empowering adolescents, as well as increasing cooperation between families, schools, and the community.
Analisis Pencatatan Transaksi Pada Usaha Kecil Menengah (Studi Toko Syair Ponsel Desa Wawo, Kecamatan Wawo, Kabupaten Kolaka Utara) Rahmadani, Riski
Jurnal Akuntansi Keuangan dan Bisnis Vol. 2 No. 4 (2025): Januari - Maret
Publisher : CV. ITTC INDONESIA

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Abstract

This research aims to find out how transactions are recorded at the Syair Ponsel Shop, Wawo Village, North Kolaka, and identify the obstacles faced by business owners. Using a qualitative descriptive approach, this research collected primary and secondary data through observation, interviews and documentation studies at the shop. Data analysis was carried out through data reduction, data presentation, and drawing conclusions. The results show that transaction recording is still simple and does not comply with the Financial Accounting Standards for Micro, Small and Medium Entities (SAK EMKM), causing a lack of knowledge of shop owners and employees.
STRATEGI EDUKASI MASYARAKAT DALAM MENANGGULANGI DAMPAK JUDI ONLINE DAN PENYALAHGUNAAN NARKOBA DI DESA HUTA TINGGI, KECAMATAN PUNCAK SORIK MARAPI, MANDAILING NATAL Asrofi Asrofi; Anriyan Makmur Matondang; Risky Aulia Nasution; Rahmadani, Riski; Inkrid Alia; Yusni Zakiah Lubis; Dina Dwi Putri; Ananda Aulia Putri; Alvini Riska; Mhd Raihan Lubis
Jurnal Ilmiah Multidisiplin Ilmu Vol. 2 No. 4 (2025): Agustus : Jurnal Ilmiah Multidisiplin Ilmu (JIMI)
Publisher : CV. Denasya Smart Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69714/rqyxxj23

Abstract

The phenomenon of increasing cases of online gambling (judol) and drug abuse among the community, especially the younger generation, poses a serious threat to the future of the nation. This community service program aims to identify the root causes of the problem and raise public the people of Huta Tinggi Village of the social, economic, and psychological impacts of both issues. Through an educational approach, field observations, and interactive dialogues, this initiative targets vulnerable groups such as teenagers, students, and parents. The results of the initiative indicate that low digital literacy, weak family supervision, and a lack of productive spaces are key factors driving high levels of community involvement in online gambling and drug abuse. Additionally, easy access to the internet and unrestricted social interactions accelerate their spread. The persuasive education provided has proven effective in fostering new awareness within the community. The initiative also involves local religious leaders and youth to strengthen the sustainability of positive messages. It is hoped that these efforts will serve as the first step toward building family- and community-based social resilience. Thus, addressing the dangers of gambling and drugs is not merely reactive but also preventive and sustainable.
THE INFLUENCE OF BRAND AWARENESS, BRAND LOYALTY AND QUALITY ON PURCHASE INTENTION OF REALME SMARTPHONE PRODUCTS IN LHOKSEUMAWE CITY (Case Study in the Community of Lhokseumawe City) Riski Rahmadani; Muchsin; Julimursyida; Samsul Bahri; Henny Irawati
International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) Vol. 3 No. 3 (2024): FEBRUARY
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/ijset.v3i3.379

Abstract

This research aims to determine the influence of Brand Awareness, Brand Loyalty, Perceived Quality on Purchase Intention for Realme Smartphone Products in Lhokseumawe City. The Brand Awareness indicators used in this research consist of being easy to remember, recognizing the type of product, having good quality and affordable prices, and good satisfaction. Then the Brand Loyalty indicators consist of trust, paying more, inviting people to buy, repeat purchases, following the news, and being able to become a spokesperson. Then the Perceived Quality Indicator consists of good quality, consistent quality, reliable products. And the Purchase Intention indicators used consist of transactional, referential and exploratory. This research uses a quantitative type with a sampling technique in the form of Accidental Sampling. The data used in this research is primary data obtained by distributing questionnaires to 102 Lhokseumawe City residents who are interested in buying Realme Smartphone Products. The data analysis technique used in this research is multiple linear regression analysis using SPSS version 23 software. The results of the research show that Brand Awareness, Brand Loyalty have a positive and significant effect on Purchase Intention for Realme Smartphone Products in Lhokseumawe City, while Perceived Quality has no significant effect on Purchase Intention for Realme Smartphone Products in Lhokseumawe City.
PEMBERDAYAAN EKONOMI MASYARAKAT MELALUI PRODUKSI GULA MERAH DI DESA HUTATINGGI, KECAMATAN PUNCAK SORIK MERAPI, MANDAILING NATAL Rizky Auliya Nasution; Kholidah Nur; Lubis, M. Raihan; Asrofi Asrofi; Andrian Matondang; Yusni Zakiah; Riski Rahmadani; Inkrid Alia; Ananda Aulia; Dina Dwi; Alvini Riska
Jurnal Ilmiah Multidisiplin Ilmu Vol. 2 No. 5 (2025): Oktober : Jurnal Ilmiah Multidisiplin Ilmu (JIMI)
Publisher : CV. Denasya Smart Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69714/08yp0h93

Abstract

This study aims to analyze the role of the gula merah (traditional brown sugar) industry in promoting the economic empowerment of the community of Huta Tinggi Village, Puncak Sorik Merapi District, Mandailing Natal Regency. Conducted by KKN students of Group 33, the research used a qualitative approach: field observation, in-depth interviews with business actors, and documentation of the production process. The main findings indicate that the gula merah industry significantly increases household incomes, creates local employment, and strengthens an economy grounded in traditional wisdom. The still-traditional production process functions as a cultural identity and presents an opportunity to increase added value through packaging innovation, quality improvement, certification, and digital marketing. Identified challenges include limited equipment, low quality standards, minimal promotion, and restricted market access. Practical recommendations include technical training and quality management for producers, investment in simple equipment, assistance with packaging and branding, guidance on digital marketing, and facilitation of market access and microfinance by local government. Partnerships with educational institutions and the private sector are also advised for product research, halal and quality certification, and research to support product diversification. In conclusion, the Huta Tinggi gula merah industry is not only economically valuable but also strategic for rural community empowerment; implementing these recommendations through immediate actions, such as training, financing access, and digital promotion, combined with regular monitoring and evaluation can sustainably strengthen local economic resilience and engage younger generations.
Co-Authors Alvini Riska Ananda Aulia Ananda Aulia Putri Andrian Matondang Anriyan Makmur Matondang Arisman Adnan Asrofi Asrofi Dina Dwi Dina Dwi Putri Haposan Sirait Henny Irawati Inkrid Alia JuliMursyida Kholidah Nur Lubis, M. Raihan Mhd Raihan Lubis MUCHSIN Muhammad Jailani Risky Aulia Nasution Rizky Auliya Nasution Rusmalinda, Riski Samsul Bahri Yusni Zakiah Yusni Zakiah Lubis