This research aims to empirically determine whether the use of the process skills approach has an influence on the science learning outcomes of fourth-grade students at SDN in the Kulon Progo region. The research is of an experimental type and was conducted at SDN Kulon Progo, specifically in the fourth-grade classes. The sample was selected using Cluster Random Sampling technique. Data collection was done using a learning outcome test as the instrument, which consisted of only objective multiple-choice questions totaling 30 items. The normality test using the Lilliefors test indicated that both classes had a normal distribution. Subsequently, a homogeneity test was conducted, showing that both classes were homogeneous. The data was then analyzed using a t-test for hypothesis testing. The calculation results showed that the calculated t-value was 3.82, while the tabulated t-value at a significance level of α = 0.05 was 1.67. This means that the null hypothesis (Ho) was rejected, and the research hypothesis (H1) was accepted. Therefore, it can be concluded that there is a significant influence of the use of the process skills approach on the science learning outcomes of fourth-grade students in Kulon Progo
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