1. Graph Types
Class A
Class B

2. All About Graphs
As a science student, graphs will be the source of constant frustration.
Why do you need to know how to graph?
???

3. All About Graphs Why do you need to know how to graph?
Data is initially collected and recorded in data tables but the information is not easily visualized this way
Rainfall (in mm)
Jan
Feb
March
April
May
2006
1.1
1.2
1.0
2007
2.0
3.1
2.9
6.0
3.4
2008
6.1
5.2
5.6
3.9
5.0
Was average rainfall higher in 2007 or in 2008?

4. All About Graphs Why do you need to know how to graph?
Data can be displayed in a graphic form to help scientists visualize and interpret the trends and variation within the data
Was average rainfall higher in 2007 or in 2008?
Key
2006
Blue
2007
Red
2008
Green

5. ??? All About Graphs Why do you need to know how to graph?
If you know how to graph you will be better able to interpret graphs yourself.
Graphs are often used in places outside of science as well.
???

6. Bar Graphs

7. Bar Graphs Title Axis labels
The purpose of a bar graph is to display and compare data.
The relative height of the bars represents the amount of each variable.
Title
Axis labels

8. Line Graphs

9. Line Graphs Title Axis labels Line of Best Fit
The purpose of a line graph is to show CHANGE OVER TIME
Title
Axis labels
Line of Best Fit

10. Line Graphs
What is a Line of Best Fit?

11. Double Line Graph

12. Double Line Graphs Title Axis labels Line of Best Fit Key
The purpose of a double line graph is to show CHANGE in more than one related variable OVER TIME
Title
Axis labels
Line of Best Fit
Key

13. Double Line Graphs
What is a Key?

14. Pie Chart

15. Pie Chart Title Sector labels Key
The purpose of a pie chart is to show data as parts of a whole
Percentages
Title
Sector labels
Key

16. Study Time Versus Grades
Scatter Plot
Study Time Versus Grades
100 * * * * 80 * * *
Grade 60 40 20 1 2 3 4 5
Study Time in Hours

17. Scatter Plot Title Axis labels
The purpose of a scatter plot is to show how closely two sets of data are related (or correlated)
The closer the line is to being straight, the more closely related the data is
Title
Axis labels

18. Scatter Plot
Which scatter plot show data which is more closely related (correlated)?