The student consistently uses correct mathematical notation, symbols, and terminology throughout the IA, demonstrating a strong grasp of relevant terms such as "Pearson's correlation coefficient" and "interquartile range." Key terms and variables are clearly defined and explained at their first introduction, contributing to the clarity of the analysis. The student effectively describes the main concepts in the introduction, outlining the relationship between GDP per capita and self-reported happiness while referencing relevant theories. Additionally, multiple forms of mathematical representation are utilized appropriately, enhancing the understanding of the data. However, the student does not state the degree of accuracy for rounded values, and the graphs, tables, and diagrams are not labeled correctly, as the titles and numbers should be placed at the bottom.
