Abstract :
The purpose of this research is to find out the correlation between vocabulary mastery and students? writing ability. This study applies total population sampling technique where the population is all of the eleventh grade students of MA Laboratorium UIN SU and the sample are 30 students. The data are collected by administering vocabulary mastery test and writing ability test. The data are analyzed by using Pearson Product Moment to investigate the correlation between both variables.
The result shows that the coefficient between variable X and variable Y is rxy = 0.514. The criteria of correlation between two variables among 0.400?0.600 shows a fair correlation. The significant level at 5% is rtable = 0.361, rxy > rtable (0.514 > 0.361). The significant level at 1 % is rtable = 0.463, rxy > rtable (0.514 > 0.463). The result of the analyses shows that there is a significant correlation between vocabulary mastery and students? writing ability of Eleventh grade student of MA Laboratorium UIN SU. Therefore, the null hypothesis (H0) is rejected and the alternative hypothesis (Ha) is accepted.