This assignment explores statistical analysis techniques applied to tax lodgement data. It covers calculating frequencies, proportions, and conducting Z-tests for comparing proportions. Furthermore, the assignment delves into correlating age range with lodgement methods and utilizes Chi-square tests to examine associations between variables. Descriptive statistics like average income and standard deviation are calculated, along with interquartile ranges (IQR) and outlier detection. Finally, linear regression is applied to model the relationship between total income and deduction amounts for both agent-prepared and self-prepared tax returns.