The Academic Procrastination Scale (APS) is summative. In other words, the scores of APS items are tallied for each participant. The resulting total score/mean represents their position (e.g., low to high, negative to positive) on the concept under investigation. You might refer to the textbook by Meyers et al. (2017) for helpful guidance.

Meyers, L. S., Gamst, G., & Guarino, A. J. (2017). Applied multivariate research: Design and interpretation (3rd ed.). SAGE Publications. https://us.sagepub.com/en-us/nam/applied-multivariate-research/book246895

Good luck,

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