Rahmawati Erma Standsyah
Universitas Negeri Surabaya

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Analisis Statistik Chi-Square Terhadap Efektivitas Suplemen Tablet Zat Besi dalam Meningkatkan Kadar Hemoglobin Dian Mustofani; Hariyani Hariyani; Rahmawati Erma Standsyah
UJMC (Unisda Journal of Mathematics and Computer Science) Vol 11 No 1 (2025): Unisda Journal of Mathematics and Computer Science
Publisher : Mathematics Department, Faculty of Sciences and Technology Unisda Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/ujmc.v11i1.10327

Abstract

This study aims to evaluate the impact of consuming iron supplementation tablets (TTD) along with milk on hemoglobin levels among adolescent girls, using the Chi-Square statistical analysis approach. A quasi-experimental design with a pretest-posttest control group was applied. The subjects consisted of 58 respondents, divided into two groups: intervention (TTD + milk) and control (TTD only). Hemoglobin levels were measured before and after the intervention and categorized as "increased," "decreased," or "unchanged" for the purpose of Chi-Square analysis. The Chi-Square test was conducted both manually and using SPSS version 25. The manual calculation, based on the formula , yielded a value of approximately with 2 degrees of freedom. The SPSS analysis showed a Pearson Chi-Square value of 35.714 with a significance level of 0.000 (p < 0.05), indicating a significant relationship between the type of intervention and the change in hemoglobin levels. These findings support the notion that consuming iron supplements together with milk may inhibit iron absorption, resulting in a decrease in hemoglobin levels. Thus, the Chi-Square analysis demonstrates the categorical effect of the intervention on hemoglobin status.
Penerapan Algoritma K-Means untuk Klasterisasi Indeks Pembangunan Manusia (IPM) pada Wilayah Pulau Jawa dengan Visualisasi Peta Tematik Siti Fadilatul Khasanah; Ayu Setya Permatasari; Elok Biandari; Rahmawati Erma Standsyah; Dimas Avian Maulana
Jurnal Ilmiah Soulmath : Jurnal Edukasi Pendidikan Matematika Vol 14 No 2 (2026)
Publisher : Universitas Dr. Soetomo

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Abstract

Abstract This study analyzes human development patterns across regencies and cities on Java Island using a clustering approach based on the Human Development Index (HDI). Persistent regional disparities in socio-economic conditions and development outcomes motivate the need to identify groups of regions with similar characteristics. The analysis uses three indicators—poverty rate, open unemployment rate, and life expectancy—calculated from recent multi-year official statistical data. The K-Means algorithm is employed to classify regions, with the optimal number of clusters determined through cluster compactness evaluation. The results identify four distinct clusters. The first cluster is characterized by low poverty, high unemployment, and relatively good life expectancy. The second cluster shows low poverty and unemployment levels with moderate life expectancy. The third cluster has the highest poverty rate, low unemployment, and relatively low life expectancy, indicating significant welfare challenges. The fourth cluster records the highest life expectancy, accompanied by moderate poverty and unemployment levels, reflecting better overall well-being. The spatial distribution of the clusters reveals a clear distinction between rural and urban areas. These findings provide a comprehensive understanding of regional disparities in human development across Java Island and offer valuable insights for designing targeted, cluster-based development policies to reduce inequality and improve regional welfare. Keywords: Human Development; HDI; K-Means; Clustering   Abstrak Pembangunan manusia antar kabupaten/kota di Pulau Jawa menunjukkan perbedaan karakteristik yang mencerminkan ketimpangan capaian kesejahteraan dan kualitas hidup masyarakat. Penelitian ini bertujuan untuk mengidentifikasi pola dan karakteristik pembangunan manusia kabupaten/kota di Pulau Jawa melalui pendekatan klasterisasi Indeks Pembangunan Manusia (IPM) berdasarkan indikator kemiskinan, tingkat pengangguran terbuka, dan Angka Harapan Hidup yang direpresentasikan dalam bentuk nilai rata-rata periode terkini berdasarkan data resmi Badan Pusat Statistik. Metode yang digunakan adalah klasterisasi K-Means untuk mengelompokkan wilayah dengan karakteristik pembangunan manusia yang serupa secara objektif, dengan penentuan jumlah klaster optimal melalui evaluasi kekompakan klaster. Hasil penelitian menunjukkan terbentuknya empat klaster wilayah dengan karakteristik pembangunan manusia yang berbeda. Klaster pertama dicirikan oleh tingkat kemiskinan relatif rendah namun tingkat pengangguran yang tinggi, dengan angka harapan hidup yang cukup baik. Klaster kedua memiliki tingkat kemiskinan dan pengangguran yang relatif rendah, meskipun angka harapan hidupnya masih berada pada kategori sedang. Kluster ketiga menunjukkan tingkat kemiskinan yang paling tinggi disertai tingkat pengangguran yang rendah, serta angka harapan hidup yang relatif rendah, sehingga mencerminkan wilayah dengan tantangan kesejahteraan yang cukup serius. Sementara itu, klaster keempat ditandai oleh angka harapan hidup yang paling tinggi dengan tingkat kemiskinan dan pengangguran pada kategori menengah, yang mengindikasikan wilayah dengan kualitas kesehatan dan kesejahteraan penduduk yang relatif lebih baik. Secara spasial, hasil klasterisasi memperlihatkan pola perbedaan yang jelas antara wilayah pedesaan dan perkotaan. Temuan ini memberikan gambaran komprehensif mengenai ketimpangan pembangunan manusia antarwilayah serta dapat dimanfaatkan sebagai dasar perumusan kebijakan pembangunan wilayah berbasis klaster. Kata Kunci: IPM; K-Means; Klasterisasi; Pembangunan Manusia
Perceived Ease Of Use As An Intervening Factor In Students’ Perceptions Of Learning Outcomes When Completing Assignments Via An AI Chatbot Rahmawati Erma Standsyah; Raden Sulaiman; Dwi Nur Yunianti; Farhan Halim Sentosa; Nabila Agatha Parsa
Mathline : Jurnal Matematika dan Pendidikan Matematika Vol. 10 No. 4 (2025): Mathline : Jurnal Matematika dan Pendidikan Matematika
Publisher : Universitas Wiralodra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31943/mathline.v10i4.1043

Abstract

ABSTRACT   The use of AI-based technologies is increasingly widespread among students, particularly to facilitate assignments and understanding of course materials. Inappropriate use by students can have a negative impact on the future of the country. The objective of this research is therefore to examine the extent to which personal and environmental factors influence students' perceptions of learning outcomes when completing homework, considering the perceived ease of use of Chatbot AI as an intervening construct. In accordance with the TAM and UTAUT frameworks, perceived ease of use acts as an intervening variable that links the influence of personal and environmental factors on learning outcomes. A quantitative methodology, based on SEM-PLS, was used, involving 154 students from SMA/SMK in Surabaya and the surrounding areas. Based on gender, female respondents were 77.9% and male respondents were 22.1%. The validity and reliability of the research instrument were tested. The direct relationship between personal and environmental factors on students' perceived learning outcomes was found to be insignificant (p = 0.277), However, however, each factor is individually significant but the mediating effect is weak and insignificant. This means that students' personal and environmental factors alone do not improve their perception of their learning outcomes, as they feel that the results of AI chatbots do not reflect their own understanding. They consider learning successful only when it involves personal effort. However, when these factors influence perceived ease of use, this ease of use becomes the determining factor in how students evaluate their learning process.