1. Chapter 1
Graphing

2. Qualitative vs. Quantitative
Qualitative data – data which cannot be measured.
Example – hair color, eye color, types of trees, color of a solution.
Quantitative data – data which can be measured.
a. Example – How much does a person weigh? How many grams of sugar is there in an apple? What is the temperature outside? Number of days. Percentage. Years.

3. Independent Variable vs. Dependent Variable
Independent variable: x-axis (manipulated variable)
The variable you have control over, what you can manipulate. It is what you think will affect the dependent variable.
Amount of light, water, temperature, time, hair color, eye color.
Dependent variable: y-axis (responding variable)
The variable you measure in the experiment and what is affected during the experiment. The dependent variable responds to the independent variable.
This is what you are measuring.

4. Line Graph
Shows the relationship between the independent and dependent variable.
Both the independent and dependent variables are quantitative.

5. Creating a Line Graph 1. Label each axis
Indicate on each axis what is being measured and in what units of measurement.
Examples: Time (minutes), Distance (meters)
Space the values so that your graph fills as much of the grid as possible.
Use the x-axis for the independent variable
Use the y-axis for the dependent variable.
Plot and connect the points.
In graphs with more than one plot, identify each plot.
Provide a title for your graph.

6. Bar Graph Used to show comparisons between groups.
The independent variable can be qualitative or quantitative.
The dependent variable is quantitative.

7. Pie Graph
Shows what percentage of 100 is represented by a piece of information.
Data adds up to 100%.
The size of each pie slice is proportional to the percentage of the category it represents.

8. Clicker Question
A student records the height of a bean plant in cm daily. This is an example of
Qualitative data.
Quantitative data

9. Clicker Question
A student records the types of animals which inhabit a one square mile area. This is an example of
Qualitative data.
Quantitative data

10. Clicker Question Identify the independent (manipulated) variable
Temperature
Freshwater oxygen content.
Neither temperature or freshwater oxygen content

11. Clicker Question Identify the dependent (responding) variable
Temperature
Freshwater oxygen content.
Neither temperature or freshwater oxygen content

12. Clicker Question Identify the independent variable. Tree species
Number chewed
There is no dependent variable

13. Clicker Question Which data would go on the x-axis? Tree species
Number chewed

14. Clicker Question What type of graph would best represent this data?
Line graph
Pie graph
Bar graph