THE CORRELATION BETWEEN VOCABULARY MASTERY AND THE WRITING ABILITY OF DESCRIPTIVE TEXT (A CORRELATIONAL STUDY OF THE EIGHTH GRADE STUDENTS OF SMP N 2 MARGOREJO PATI IN ACADEMIC YEAR 2013/2014)

Writing is one of four basic skill which studied by students. Further, there are many kinds of writing texts that has learnt by students in learning process. One of them is writing descriptive text. There are many factors can influence in good writing, one of them is vocabulary. Its mean if the students want to write the text especially the descriptive text, they should be master much vocabularies. The objective of study is to find out whether there is any correlation between vocabulary mastery and writing ability of descriptive text the eighth grade students of SMP N 2 Margorejo Pati in the academic year 2013/2014 This is a correlational study. The subject of the research is the eighth grade students of SMP N 2 Margorejo Pati in the academic year 2013/2014 with the number of students 36. The design of this research is correlative that’s belong to quantitative research. The instrument used was a test. Type of vocabulary test is multiple choice and writing test is essay test which asking students to make sentences into a paragraph. The result of the research shows that the mean from the mastery of vocabulary is 61.44, and standard deviation (SD) is 9.05. From the data of mean, it can be categorized average. Then, the mean for writing ability of descriptive text is 59.54, and standard deviation (SD) is11.63. From the data of mean, can be categorized low. From the data, 0.648 is gotten for the coefficient rxy. Because of the coefficient rxy is not equal with 0, the null hypothesis (h0) is rejected and the alternative hypothesis (ha) is confirmed. Therefore, there is a significant correlation between the mastery of vocabulary and the writing ability of descriptive text of the tenth grade students of SMP N 2 Margorejo Pati in academic year 2013/2014. Because of the rxyis 0.648, it can be categorized high correlation. Considering the process and the results of this research, the students should master good vocabulary because if they have good vocabulary, they will be great in written text. Then, the teacher if teach the students about write of descriptive text should teach them the vocabulary first. Because both of them have high correlation