Using Students’ Native Language, Mandar, as Instructional Language in English Class to Increase Reading Achievement of the Tenth Grade Students of SMAN 1 Tinambung

ABSTRACT The objectives of this research were : (i) to find out whether using students’ native language,Mandar,as instructional language in English class increases the students’ reading achievement (ii) to find out the students’ activities in studying English using their native language (iii) to uncover the students’ interest in studying English by using their native language . This research employed a quasi-experimental design. The population of this research was the tenth grade students of SMAN 1 Tinambung in academic year 2015/2016. This research is used cluster random sampling technique. The research data were collected by using reading test and were subjected descriptive and inferential statistic using SPSS version 20.0 for windows program. The students’ score on posttest of experimental group (81.04) is more significantly improved than the students’ score on posttest of control group (65.06). The difference of both scores is statistically significant based on the t-test (p