AP Statistics: Measures of Variability

Statisticians use summary measures to describe the amount of variability or spread in a data set. For AP Statistics, students are expected to know about four measures of variability: the range, the interquartile range (IQR), variance, and standard deviation. This video describes each measure and shows how to compute a value for each measure. View written lesson here: https://stattrek.com/descriptive-statistics/variability