## Introduction to Frequency Graphs for One Quantitative Variable

**The point is to learn how to "pile up" values that are close together to provide a two-dimensional picture of the data.** This is the key idea on which much of the whole discipline of statistics is based. For now, just watch these four, in sequence. We go from graphing points on a number line to "piling up" points so it is easier to see how much data is "close together."

- Use an individual value plot to remind you of putting points on a number line (from your elementary math classes.)
- Use a dotplot to see how the values "pile up" to form a frequency graph
- Histograms are generalizations of dotplots, where you "pile up" nearby data values by taking intervals of values to make a bar.
- Stemplots are sometimes used as a quick way of organizing the numbers.

Go here to use visualize applets to explore each of these in much more detail.

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