This study was designed to investigate the effect of WhatsApp on students’ writing of SMK PGRI 2 Kediri. The subject of the research was 30 female students of XI Banking I class of SMKN 2 Kediri in the academic year 2018-2019. This is pre-experimental quantitative research with one group pre-test post-test design. The data collected by comparing results of pre-test and post-test with the mean score 4.167 and standard deviation 2,276, and then the data analyzed using Paired Sample T-test on IBM SPSS Statistic version 23. The result showed that t-score 10,029 with the significance (2-tailed) value was higher than t-table at the level of significance 0.01 which was 2,462. It can be concluded that WhatsApp has significant effect on students’ writing of SMK PGRI 2 Kediri in the aspect of grammar, generic structure, and mechanics. For the teachers who interested in applying WhatsApp on teaching learning process, it is suggested to prepare more time in order to cover all the students’ problems.
KEYWORDS: Writing, WhatsApp.
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