The objective of this research is to find out if the use of Kahoot Game can improve students’ vocabulary mastery of SMA Negeri 8 Palu. This research used quasi-experimental design that consisted of two groups; experimental and control group. The samples of this research was the eleventh grade students of SMA Negeri 8 Palu; IPA 2 with 27 students as the experimental group and IPA 3 with 25 students as the control group that selected by using purposive sampling. The data was collected by administering test consisted of a pre-test and post-test that conducted at first and last meetings. Then the treatment was only given to the experimental group. The result of experimental group’s pre-test is 39.44, while control group is 34.6. The result of experimental group’s post-test is 77.03, while control group is 61.2. By applying 0.05 level of significance, the researcher found that the value of the t-counted (3.31) is higher than the t-table (1.677). In conclusion, the use of Kahoot Game in teaching vocabulary is effective to improve students’ vocabulary mastery of SMA Negeri 8 Palu. Based on these results, it implies that Kahoot Game can be applied by teachers in teaching and learning process as one of effective strategy to improve students' vocabulary mastery.
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