## Statistics

Displaying and describing data
One of the first things we do in statistics is try to understand sets of data. This involves plotting the data in different ways and summarizing what we see with measures of center (like mean and median) and measures of spread (like range and standard deviation). This topic focuses on concepts that are often referred to as "descriptive statistics".
Statistics overview
Categorical data displays
Two-way tables for categorical data
Dot plots and frequency tables
Histograms
Comparing features of distributions
Stem-and-leaf plots
Line graphs
Mean and median: The basics
More on mean and median
Range, Interquartile range (IQR), Mean absolute deviation (MAD)
Box and whisker plots
Population variance and standard deviation
Sample variance ...