What type of study is this?

This is a Pre-Registered Trial study.

The Use of Duolingo Apps to Improve Students’ Vocabulary Mastery of SMP Negeri 4 Palu

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Pre-experimental design shows Duolingo significantly improves vocabulary mastery, indicating effective learning media.

The use of Duolingo application improved students' vocabulary mastery from pre-test to post-test scores.
Post-test scores averaged 73.23 compared to pre-test scores of 63.39, highlighting significant improvement.
Statistical analysis revealed a t-counted value of 212.31, exceeding the critical t-table value of 1.697.
This study supports the effectiveness of Duolingo for enhancing vocabulary learning among seventh graders.

Achmad et al. (2025) studied this question.

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