To answer a statistical question, we collect data, which consist of measurements of a variable. When the measurements we collect differ from each other, variation exists. We can examine this variation in several ways to find interesting answers to the statistical questions we pose.
For example, we can look at the distribution of a data set -- the different values and how often each occurs -- to draw out informative patterns in the variation. Tabular and graphical representations of the data can help to display these patterns.
In the video segment below, Professor Kader and the participants examine the distribution of a data set to help explain an intriguing aspect of the variation they find. Professor Kader also introduces the uses of graphical and tabular representations. Note 2