The aim of this study is to determine the effects of vocabulary size and vocabulary depth on reading performance in EFL context. To this end, Vocabulary Size Test by Nation and Beglar (2007), Words Associate Test by Read (1998), and a reading performance test, the reliability of which was found to be .81 were administered to 361 university students. In the analysis of the data, linear regression and Pearson correlation statistics were used. The results showed that vocabulary size and vocabulary depth were both significantly correlated to reading performance, but vocabulary depth predicted reading performance better.
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