# Types of Graphs and when to use them

After collecting data many times it is helpful if create a graph of this data, but what type graph should you create?

Here a chart that summarizes the different types of graphs and when to use them.

A bar graph is helpful to use when you have categories.

Here is an example, notice the categories.

**double bar graph**is great for comparing sets of data, but not great for items involving time.

A

**box and whiskers**is good for showing measures of variation.For example, if you have a box and whisker on runners in a race you can quickly see the variation of the age of runners and oldest and youngest runner quickly.

A

**histogram**is great at showing frequency of data in intervals.Here is an example.

A

**line graph**is great at showing change over time.
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