1. Intro to Graphing

2. Why do we make graphs?
Graphs and charts are great because they communicate information visually.
They are also helpful in identifying certain trends.

3. Types of Graphs…
Pie Chart
Bar Graph
Line Graph

4. Pie Charts Pie charts can be used to show percentages of a whole.
Types of cars sold in 2001
Pie charts can be used to show percentages of a whole.
They represent percentages at a set point in time. They do not show changes over time.
27%
Diesel
65% Gasoline
8% Electric

5. Bar Graphs Bar Graphs are used when displaying discrete data.
You can tell if your data is discrete if you can separate it into categories and if the order you list these categories does not matter.
Examples of discrete data: brands, colors, names, gender, etc.

6. Line Graphs Line graphs are used when displaying continuous data.
Data is continuous if it comprised of numbers and if the order of the numbers matters.
Examples of continuous data: time, temperature, distance, mass, height, etc.

7. Bar and Line Graph Characteristics
X axis
Y axis
The manipulated variable is always on the X axis
The responding variable is always on the Y axis Y
Responding variable X
Manipulated variable

8. Bar and Line Graph Characteristics
The scales on each axis have even intervals.
Notice that the intervals do not need to be the same size on both axes! Y
250
200
150
100 50 X 5 10 15 20 25 30 35

9. Bar and Line Graph CharacteristicsY
(cm)
Each axis is labeled.
Each label has a unit.
250
200
150
Plant Height
100 50 X 5 10 15 20 25 30 35
Time
(days)

10. Bar and Line Graph CharacteristicsY
(cm)
Plot your points…
250
200
150
Plant Height
100 50 X 5 10 15 20 25 30 35
Time
(days)

11. Bar and Line Graph CharacteristicsY
…or draw your bars.
250
200
Bee Emergence Time (sec)
150
100 50 X A B C
Perfume Types

12. Bar and Line Graph Characteristics
The Effect of Different Perfumes on Bee Behavior Y
And don’t forget to give your graph a descriptive title!
250
200
Bee Emergence Time (sec)
150
100 50 X A B C
Perfume Types