What type of study is this?

This is a Quasi-Experimental study.

The Effect of Problem Based Learning Model on Students Mathematical Critical Thinking Ability

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Quasi-experimental study shows problem-based learning improves mathematical critical thinking, indicating its effectiveness over STAD technique.

Students using problem-based learning showed a significant increase in mathematical critical thinking skills.
The hypothesis testing revealed that the t-test results favored the problem-based learning model.
The study involved 55 students from two classes, demonstrating various learning outcomes.
The research utilized pretest-posttest group design to measure changes in critical thinking ability.

Mufidah et al. (2025) studied this question.

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Quasi-experimental study shows problem-based learning improves mathematical critical thinking, indicating its effectiveness over STAD technique.