<![CDATA[Abstract: The Effect of Guided Discovery Learning Towards Students Mathematical Problem Solving and Self-Efficacy. This experimental research aimed to find out of effect of guided discovery learning model towards students problem solving skill and self-efficacy. The population in this research was all students of grade 8th of SMPN 12 Bandarlampung in academic year 2018 2019 as many as 299 students, that distributed into ten classes. The student of class VIII B as many as 28 students and class VIII C as many as 31 students were selected as research samples by cluster random sampling technique. The design used in this research was the pretest posttest control group design. The data in this research was quantitative data that obtained by mathematical problem solving test and self efficacy scale. The data were analized used t test and Mann Whitney test. The result of analysis data was known that theres been a change in the students problem solving skill and students self-efficacy. Those change indicate that there is an increase of the data students problem solving skill and students self-efficacy through guided discovery learning model was higher than the data of students problem solving skill and students self-efficacy through non guided discovery learning model. So that, guided discovery learning model has effect towards the students mathematical problem solving skill and self efficacy. Keywords: guided discovery learning, mathematical problem solving, self-efficacy Abstrak: Pengaruh Guided Discovery Learning Terhadap Pemecahan Masalah Matematis dan Self-Efficacy Siswa. Penelitian ini bertujuan untuk mengetahui pengaruh model guided discovery learning terhadap kemampuan pemecahan masalah matematis dan self-efficacy siswa. Populasi dalam penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 12 Bandarlampung tahun pelajaran 2018 2019 sebanyak 299 siswa yang terdistribusi dalam sepuluh kelas. Siswa kelas VIII B sebanyak 28 siswa dan VIII C sebanyak 31 siswa terpilih sebagai sampel penelitian yang diambil dengan teknik cluster random sampling. Desain yang digunakan adalah pretest-posttest control group design. Data penelitian berupa data kuantitatif yang diperoleh dari hasil tes kemampuan pemecahan masalah matematis dan skala self efficacy. Analisis data dalam penelitian ini menggunakan uji-t dan uji Mann Whitney dengan . Dari hasil analisis data terdapat perubahan pada kemampuan pemecahan masalah matematis dan self efficacy siswa. Perubahan tersebut ditunjukkan dengan adanya peningkatan pada kemampuan pemecahan masalah dan self efficacy siswa dengan model guided discovery learning yang lebih tinggi daripada data kemampuan pemecahan masalah matematis dan self efficacy siswa dengan model non guided discovery learning. Dengan demikian, model guided discovery learning berpengaruh terhadap kemampuan pemecahan masalah matematis dan self-efficacy siswa. Kata kunci: guided discovery learning, pemecahan masalah matematis, self-efficacy]]>
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