In this section, we motivate and discuss the most common descriptive statistics that provide information about how spread out data are; we call such descriptive statistics measures of dispersion. We s...In this section, we motivate and discuss the most common descriptive statistics that provide information about how spread out data are; we call such descriptive statistics measures of dispersion. We shall discuss some of the most common measures: range, interquartile range, mean absolute deviation, variance, and standard deviation.