Validity testing is the process of evaluating whether a research instrument that will be used to assess a study variable may be deemed valid or not. Finding out the outcomes of validity and reliability testing on teenagers using the Indonesian DASS-Y was the aim of this study. With 105 teenage respondents, a quantitative approach was employed in this study. The findings indicated that, with a value of 1.00, the questionnaire's validation value was deemed practical, very relevant, and had high validity. The findings of the DASS-Y instrument in the Indonesian version were deemed to be both valid and reliable, with the reliability score test being.930 and the validity test Correlatet item-total correlation score rage.328-.753.
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