Melliza Lateng. 2021. The Effectiveness of Crossword Puzzle Games in Teaching Vocabulary at Junior High School. (Supervised by Musliadi and Musfirah).

This research aims at determining the effectiveness of crossword puzzle game
in teaching vocabulary at Junior High School. The subject of this research is the
second grade students of junior high school in South Sulawesi. The researcher
applied purposive sampling. The method that use in this research is pre-experimental
design. The instrument research was vocabulary test. The results of this research
indicate that the use of Crossword Puzzle in teaching English for vocabulary in class
VIII at Junior High School is increase. This shows that there are significant
differences between students’ scores in pre-test and post-test. The mean score of the
students’ pre-test is 65.20 and 93.00 in the post-test. Furthermore, the result of
computation of t-test show P-value < α (0.00<0.05) with degree of freedom N-1 (10
1=9). It means that, null hypothesis (H0) rejected and alternative hypothesis (H1)
accepted. So, there is significant difference between the result of pre-test and post-test
after the treatment. Therefore, the researcher conclude