Öz
This study aims to examine the students who participated in the 2018 PISA research with their
mathematics, science and reading scores, and their relationship with being happy and sad, being
satisfied with their life, and finding a meaning in their life. 600,000 students in the 15-year age
group from 79 countries participated in the PISA 2018 survey. The data of this research consists
of the mathematics, science, reading scores of students participating in PISA 2018 and answers
related to the research questions obtained from the main student survey. Educational data mining
techniques were used in the analysis of the data. RapidMiner program and SPSS package software
were used for data analysis. Correlation analysis has been revealed by using decision trees. As a
result of the findings obtained, it was observed that the math, science and reading scores of the
countries increased as the happiness rate of the students increased. It was observed that
mathematics, science and reading scores were low when the satisfaction level of life was too high
or low, and the countries where students who were very satisfied with their life were concentrated
had low math, science and reading scores. In line with the findings of the research, various
suggestions have been made for policy makers, educators, and researchers.