Review Study Learning Apps in Teaching Vocabulary Using Duolingo

The objective of this research is to find out whether there is or not effectiveness Duolingo application in teaching vocabulary at tenth grade of SMA N 2 Purworejo. The design of this research was quasi experimental research which belongs to the quantitative method. The researcher determines this study as quantitative in the form of quasi experimental design that involves one only group pre-test and post-test. The population of this study was tenth grade of SMA N 2 Purworejo. By employing purposive sampling technique, the sample of this study are consist 36 students from X IPS 1. Then, the instrument in this research is consisted of forty question multiple choice for pre-test and post-test. To compare the result of pre-test and post-test used Mann-Whitney U-test in SPSS 16.0. The result shows the mean score of post-test it could be seen that the mean of the post-test score (73.40) was larger, that the mean of pre-test score (49.30). While, the Zvalue is 7.972 and the Ztable is 1.96. It means that Zvalue is higher than Ztable that is 7.972 > 1.96. So, it could be concluded that the use of Duolingo application in teaching vocabulary at tenth grade students of SMA N 2 Purworejo in the academic year 2019/2020 is effective.