This chapter discusses descriptive statistics and numerical measures used to describe data. It will cover computing and interpreting the mean, median, mode, range, variance, standard deviation, and coefficient of variation. It also explains how to apply the empirical rule and calculate a weighted mean. Additionally, it discusses how a least squares regression line can estimate linear relationships between two variables. The goals are to be able to compute and understand these common descriptive statistics and measures of central tendency, variation, and shape of data distributions.