Pengaruh Discovery Terbimbing terhadap Pemahaman Konsep Matematis pada Materi SPLDV

Aldyan Sahputra; Bistari Bistari; Rustam Rustam

doi:10.31932/j-pimat.v8i2.7711

Pengaruh Discovery Terbimbing terhadap Pemahaman Konsep Matematis pada Materi SPLDV

Aldyan Sahputra, Bistari Bistari, Rustam Rustam

Abstract

This study examined the effect of Guided Discovery on students’ mathematical conceptual understanding of systems of linear equations in two variables. It used a quantitative, quasi-experimental approach with a nonequivalent control group design. The participants were 60 ninth-grade students at SMP Negeri 9 Pontianak, with 30 students in the experimental class and 30 in the control class. Understanding was assessed using five constructed-response items. All items met the validity criteria, with correlation coefficients ranging from 0.892 to 0.947; Cronbach’s alpha was 0.958. Data were analyzed using descriptive statistics, the Shapiro–Wilk test, the Wilcoxon signed-rank test, and the Mann–Whitney U test. The experimental class’s mean score increased from 5.67 on the pretest to 52.87 on the posttest, yielding a mean gain of 47.20. The control class’s mean score increased from 8.00 to 9.50, yielding a mean gain of 1.50. The Wilcoxon test showed a significant change in the experimental class (p < 0.001), but not in the control class (p = 0.270). The Mann–Whitney U test on gain scores showed a significant difference in improvement between the classes (U = 27.00; Z = ?6.266; p < 0.001), with mean ranks of 44.60 and 16.40 for the experimental and control classes, respectively. The effect size was large (r = 0.809). These findings indicate that the class taught using Guided Discovery showed greater improvement in mathematical conceptual understanding than the control class.

Keyword: guided Discovery; mathematical conceptual understanding; SPLDV

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DOI: https://doi.org/10.31932/j-pimat.v8i2.7711