Yani Supriani, Tatang Herman, Turmudi
This study is based on the fact that students have low abilities in formulating conjectures and mathematical justifications. In order to solve the problem, this study is carried out by utilizing preloved products based on experiential learning. This is a quasi design - an experimental through nonequivalent control group design by using purposive sampling technique. The populations of this study are the 7th grade students of junior high school in Serang City - Banten academic year 2018/2019. The samples are the 7th grade students of a junior high school in Serang. The instruments employed in this study are as follow : tests of formulating the conjecture and students' mathematical justifications, attitude scales, and also observation sheets of teacher and students' activities. Quantitative analysis is performed by applying the mean difference tests. The results of this study show these following things : (1) Students who are exposed to using preloved products based on experiential learning improve their ability in formulationg the conjecture better than those who are exposed to conventional learning approach in terms of total students and their prior levels of mathematical knowlede (high, medium and low); (2) Students who are exposed to using preloved products based on experiential learning improve their abilities in mathematical justifications better than those who are exposed to conventional learning approach in terms of total students and their prior levels of mathematical knowledge (high, medium, and low). © Published under licence by IOP Publishing Ltd.
Universitas Pendidikan Indonesia, Indonesia
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