1. Wake-up
An experiment was conducted to find out if different temperatures affect the respiration (breathing) rate of goldfish.
Identify the independent variable
Identify the dependent variable
List 2 controls

2. Wake-up
An experiment was conducted to find out how effective different soaps are at killing bacteria.
Identify the independent variable
Identify the dependent variable
List 2 controls

3. Wake-up List five pieces of lab equipment in the picture.
What are three pieces of lab equipment that can be used to measure volume?

4. Graphing
Christopherson

5. List three “things” that you know about graphs

6. What are some different types of graphs
What are some different types of graphs? Explain the difference between each.

7. What is a Graph?
A diagram showing the relationship between (typically) two variables, each measured along a pair of axes (x and y)

8. How to Graph???

9. a. Identify the Variables
Dependent - What is measured
Independent – What is varied/changed
pH of Water
Number of Tadpoles
Dependent: Number of Tadpoles
Independent: pH of Water

10. b. Label axis The dependent variable goes on the y-axis
The independent variable goes on the x-axis

11. Number of Tadpoles
pH of Water

12. c. Determine the axis scale
Spread the graph out to the MOST available space. Take up ALL the graph paper.
You don’t ALWAYS have to start from zero. Find the lowest value and go down a bit.

13. d. Plot data points pH of Water # of Tadpoles 8.0 45 7.5 69 7.0 78 6.588
6.0 43
5.5 23

14. e. Connect the data points using a ruler

15. f. Title the graph

16. *Fish Respiration and Temperature