The Effect of Mental Model on The Students Speaking Achievement

Abstract

This study deals with the effect of mental model on speaking achievement of the eleventh grade students of SMA Negeri 4 Pematang Siantar. The objective of the study was to examine and prove whether or not mental model affected speaking achievement of the eleventh grade students of SMA Negeri 4 Pematang Siantar. The research was conducted by using experimental quantitative design. The population of this study was the students of the eleventh grade of SMA Negeri 4 Pematang Siantar. There were four classes of which students were 30 in each class. The population was totally 60 students. The sample of research which was determined by purposive sampling technique was 60 students. The sample was divided into two groups. XI IPS1 as experimental group was a group who was taught by applying mental model and XI IPS2 as control group was taught by applying conventional model. The instrument of collecting data was speaking test. From the data calculation, the researcher found that the mean score of experimental group was 24, mean score of control group 20.1, deviation score of experimental group ( 〖dx〗^(2 )) was 1607 and deviation of control group ( 〖dy〗^2 ) was 454.7. It means that mental model significantly affected speaking achievement of the eleventh grade students of SMA Negeri 4 Pematang Siantar. The Improvement of speaking achievement of students who were taught by using mental model was better than students who were taught without using mental model. Therefore, it was suggested to English teachers to apply mental model in teaching speaking especially for students of senior high school.