This book provides a comprehensive exploration of descriptive statistics, presenting both foundational concepts and advanced methodologies for summarizing and interpreting data. It begins by addressing essential measures of central tendency, such as the mean, median, and mode, which provide insight into the central characteristics of a dataset. Complementing these, measures of dispersion, including range, variance, standard deviation, and interquartile range, are systematically discussed to assess the spread and variability of data. The book further delves into the construction of frequency distributions, the use of cumulative frequencies, and the creation of graphical representations such as histograms, box plots, and scatterplots, offering practical techniques for visualizing data effectively. Additionally, the book examines bivariate analysis, introducing key concepts like covariance and linear correlation to quantify relationships between two variables. The method of least squares is employed to derive regression equations, with detailed steps provided for calculating regression lines.