THE CONTRIBUTION OF VOCABULARY MASTERY TOWARD READING COMPREHENSION

This research is aimed to determine the correlation between vocabulary mastery and reading comprehension of the 8th grade students of SMP Negeri 4 Wates in the academic year of 2013/2014. The type of this research was non-experimental research study or in other words ex-post facto research. The instruments of this research include instrument try-out test and tests of vocabulary mastery and reading comprehension. The research was carried out in April 2014 at SMP Negeri 4 Wates. The method used in this study was a correlational study. The population was all of the 8th grade students of SMP Negeri 4 Wates in the academic year of 2013/2014 which consists of five classes. The sample was 28 students taken by cluster random sampling technique. The instruments in collecting the data were tests. The tests were used to collect the data of vocabulary mastery and reading comprehension. The technique which was used to analyze the data was Linear Regression analysis Statistic by using SPSS 16. The results of the sresearch show that there is a correlation between students’ vocabulary mastery and students’ reading comprehension. The correlation is positive and significant. The result of the hypotheses testshowed that the coefficient of correlation is 0.600 and the total effective contribution of vocabulary mastery is 36%. The significance of F is 0.001 < 0.05.It means that Ho is rejected. So, there is a positive correlation between vocabulary mastery and reading comprehension of the 8th grade students of SMP Negeri 4 Wates in the academic year of 2013/2014.Regarding the result of the research, it can be concluded that vocabulary mastery haspositive contribution in reading comprehension. Itcontributed to improve reading comprehension although reading comprehension does not completely depend on the variables