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Searching for ## Bar, Line, and Circle Graphs

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Math Foundations

You will represent some of the important events in the world by using bar graphs.

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After completing this tutorial, you will be able to complete the following:

- Use real-world data to construct bar graphs.
- Answer questions by interpreting bar graphs.

A bar graph is a visual representation of a set of data.

A bar graph is a graph that compares different amounts using bars. Each rectangular bar represents the value of a specific group or category. Bar graphs are typically used when comparing categorical data. Categorical data is data that can be placed into categories that are mutually exclusive.

Example:

In this example taken from the Activity Object, the bar graph represents the number of tornadoes in the U.S. for each year from 1998 - 2003. The data for Year is the categorical data because each year is a category that stands alone. The bars show the number of tornadoes occurring in a specific year.

Though you can extract trends between bars (e.g., they are gradually getting longer or shorter), you cannot determine changes over time or determine a slope. Each bar in the graph is independent from one another.

Bar graphs are created using the x and y axes on a coordinate grid.

The x-axis and y-axis are two lines that create the coordinate plane. The

x-axis is a horizontal line and the y-axis is a vertical line.

Example:

In the above bar graph, the x-axis represents the year. This is the categorical data. Because the categorical data appears on the x-axis this is a vertical bar graph. If the categorical data appeared on the y-axis, the bars would run across the page making this a horizontal bar graph. The y-axis represents the number of tornadoes. This is the numerical or quantitative data.

Approximate Time | 15 Minutes |

Pre-requisite Concepts | Students should be familiar with drawing bar graphs. |

Course | Math Foundations |

Type of Tutorial | Skills Application |

Key Vocabulary | bar graph, data, table |