1. Review of Graphing
Understanding Graphs

2. A graph is a visual display of information or data
A graph is a visual display of information or data. Graphed data has greater impact.
Trends (changes) stand out
Quantities can be easily compared

3. Line Graphs – are used to show trends or how the data change over time.

4. Bar Graphs – are useful for comparing information

5. Circle (pie) Graphs – are used to show how a quantity is broken down into parts.

6. Graphing Basics Bigger is better Each graph needs a descriptive title
Axes should be clearly marked (with units)
Use a ruler to draw axis lines
X – axis is along the bottom
Y – axis is vertical (along the side)
Lines drawn for units are equally spaced

7. Check for understanding
Which type of graph is used for the following?
Data changing over time.
line
Parts of a whole
Pie
Data that is compared
Bar

8. Check for understanding
Which type of graph is used for the following?
Measurements of a tree’s growth
line
The percent composition of a sample of soil
Pie
The populations of different countries in 1984
Bar