Bar GraphsFoundations of Algebra

What is a Bar Graph?? A Bar Graph uses rectangular bars or objects

to represent data. They can be used to compare individual years or other distinct items.

For example: Comparing the price in jeans, shorts, and

t-shirts from a given store. Comparing the types of music a class likes Comparing the heights of boy and girls in

a gym class

Ways to Display Data

Now you have three ways to represent data: Stem and Leaf Plots, Box and Whisker Plots, and Bar Graphs.

A bar graph is useful for comparing facts. The bars provide a visual display for comparing quantities in different categories. Bar graphs help us to see relationships quickly. Another name for a bar graph is a bar chart. Each part of a bar graph has a purpose.

The Parts of a Bar Graph

Example of a Bar Graph

Example

Double Bar Graph – Compare two pieces of data at one time on the same graph

Category 1 Category 2 Category 3 Category 40

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

BoysGirls

Horizontal Bar Graph

Go 3D

Bar Graphs vs. Histograms

Reading a Graph and

Answering the Questions