Another finding also shows that based on the results of the Rasch model test, it shows that in the experimental class the indicators of critical thinking skills and scientific attitudes are mostly possessed the ability to synthesize attitudes towards scientific investigations. So, it can be concluded that there is a contribution of problem-based learning models on critical thinking skills and scientific attitudes of students with the contribution of 28%. Empirical evidence shows that based on Hotelling's T2 test results obtained a significance value of 0.001 < (0.05) with a partial eta squared value of 0.28 which means Ha is accepted. The data were analyzed using Hotelling's T2 test and the Rasch model. This research has been carried out for 3 months from September-November in 2021 on pre-service chemistry teachers. This quasi-experimental research uses pre-test and post-test through an unequal control group design. This study aims to determine the effect of applying problem-based learning models on critical thinking skills and scientific attitudes of pre-service chemistry teachers in Basic Chemistry 1.
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