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All Journal RADIASI: Jurnal Berkala Pendidikan Fisika Physics Learning and Education
Putri, Nur Tasya
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Education Physics

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Analysis of Validity, Reliability, Difficulty Level, and Discrimination Power of Students’ Critical Thinking Skill Test on Phase F Fluid Materials in Senior High School Putri, Nur Tasya; Emiliannur, Emiliannur
Physics Learning and Education Vol. 4 No. 1 (2026): March Edition
Publisher : Department of Physics Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/ple.v4i1.314

Abstract

A high-quality assessment instrument is one that provides data that reflects actual conditions, is consistent and reliable, demonstrates varying levels of difficulty, and has a good discrimination index. Therefore, this study aims to test the validity, reliability, difficulty level, and analytical power of the items used to assess students' critical thinking skills. This study is descriptive and evaluative. The subjects were 31 11th-grade students at SMA Negeri 2 Painan. The data collection method used was a test. The study results indicated that for Grade XI, 17 test items were deemed valid, whereas 1 item was invalid. The reliability coefficient for Grade XI was 0.877, demonstrating that the test instrument is reliable. Regarding difficulty level, all 18 items were classified as difficult. In terms of discrimination power, 5 items fell into the poor category, while 13 items were categorized as fair. Based on the analysis of physics test items on the topic of fluids for the 2024/2025 academic year at SMA Negeri 2 Painan, it was concluded that the 11th-grade test items were valid and reliable. This indicates that the test items can be used as an evaluation tool.
The Effect of Project-Based Learning With Liveworksheet for Improving Students’ Critical Thinking Skills Putri, Nur Tasya; Emiliannur, Emiliannur; Sari, Silvi Yulia; Winarno, Nanang; Hakim, Lukman
Radiasi : Jurnal Berkala Pendidikan Fisika Vol. 19 No. 1 (2026)
Publisher : Universitas Muhammadiyah Purworejo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37729/radiasi.v19i1.6631

Abstract

This study aims to check how the PjBL approach in the e-LKPD method improve students’ critical thingking skills at SMA N 1 Batang Kapas. The research used a one-group pretest-posttest design within a quasi-experimental framework. The population consisted of all Grade XI Phase F students at SMA N 1 Batang Kapas who took physics classes. The students’ were divided into two experimental groups, selected using purposive sampling, comprising two classes with 60 students in total. Data analysis used descriptive statistics including normality tests, t-tests with a significance threshold of 0.05. Research data was collected through essay tests administered in the form of pretests and posttests. Data analysis examined the KKTP scores, followed by the N-gain test, the normality test, and the hypothesis test. The analysis results showed that the KKTP comparison resulted in an increase in student learning outcomes of 93.33 percent. The n-gain test results of 0.69 and 0.64 were in the moderate category. The normality test results indicated that students' critical thinking skills were normally distributed. Based on the hypothesis test, there was a significant difference between the average pretest and posttest scores of students. Therefore, it can be concluded that the Project-Based Learning-Based e-LKPD is effective in improving students' critical thinking skills.
Co-Authors Emiliannur Emiliannur Lukman Hakim Nanang Winarno Silvi Yulia Sari