The Correlation between Students’ Vocabulary Mastery and Their Writing Ability at Eighth Grade of SMP N 22 Purworejo in the academic year of 2013/2014

Abstract

The purpose of this research are (1).to describe the students’ vocabulary mastery. (2).to describe the students’ writing ability. (3).to find out whether there is any positive and significant correlation study between student’ vocabulary mastery their writing ability. In addition, the researcher took 62 students among the population 224 students in the eighth grade of SMP N 22 Purworejo as my samples of my research. The method of the research is test, the researcher got data using vocabulary test and writing test. Then, the researcher calculates both manually and by using SPSS version 16. Ba0sed on the computation, the researcher find three things. First, the mean of students vocabulary mastery is 64.2 and it is categorized as fair. Second, the mean of students writing ability is 64.3 and it is categorized as fair. Third, there is a positive and significance correlation between students’ vocabulary mastery and their writing ability, the value of r is 0.587>0.254. The findings shown above can be proved from the number of samples (N=62) and the level of significance (5%), the result of the computation done both manually and by SPSS is 0.587. Based on the value in the table of r product moment, for N=62 and the significance level =5%, the value of r product moment (rt) that is 0.587 > 0.254 and it is categorized as a medium correlation. It means that there is a medium correlation between students’ vocabulary mastery and their writing ability.