Summarizing quantitative data

Measuring center in quantitative data
More on mean and median
Interquartile range (IQR)
Variance and standard deviation of a population
Variance and standard deviation of a sample
More on standard deviation
Box and whisker plots
Other measures of spread
About this unit
This unit covers common measures of center like mean and median. We'll also learn to measure spread or variability with standard deviation and interquartile range, and use these ideas to determine what data can be considered an outlier.