2. Vocabulary: Manipulated variable => responding variable independent variable => dependent variable “x” => “y” Cause => effect AIM: What are Variables?

3. VARIABLES WHAT IS A MANIPULATED VARIABLE? Thing that you “change” in an Experiment Manipulated Variable Independent Variable “x”

4. VARIABLES WHEN YOU CHANGE THE MANIPULATED VARIABLE THE RESPONDING VARIABLE IT CHANGES ALSO!

5. `` AS an example: How would you devise an experiment which would test whether a fertilizer actually helped plants grow? What is the independent variable? What is the dependent variable VARIABLES

6. `` AS an example: How would you devise an experiment which would test whether sunlight actually helped plants grow? What is the independent variable? What is the dependent variable VARIABLES

7. `` AS an example: How would you devise an experiment which would test whether Mr. Z’s fish could live in salt water? What is the independent variable? What is the dependent variable VARIABLES

8. `` EXAMPLE: Suppose you did a study which concluded that the more a student studies the higher grade a student receives What is the manipulated variable? What is the responding variable VARIABLES

9. `` EXAMPLE: Suppose you did a study which concluded that the older people become, then the higher becomes their IQ What is the manipulated variable? What is the responding variable VARIABLES

10. `` EXAMPLE: Suppose you did a study which concluded that the more children watch TV, then the lower their SAT scores What is the manipulated variable? What is the responding variable VARIABLES

11. `` EXAMPLE: Suppose you did a study which concluded that the more fertilizer a plant receives, then the more flowers it produces What is the manipulated variable? What is the responding variable VARIABLES

12. `` EXAMPLE: Suppose you did a study which concluded that oceans which have a higher “salt” content will have less fish What is the manipulated variable? What is the responding variable VARIABLES

13. `` EXAMPLE: Suppose you did a study which concluded that the faster a car travels, the less its fuel economy will be What is the manipulated variable? What is the responding variable VARIABLES

14. `` EXAMPLE: Suppose you did a study which concluded that as the average temperature in a pond increases, then the the average number of frog “croaks” (per minute) increases EXAMPLE: Suppose you did a study which concluded that as the average temperature in a pond increases, then the the average number of frog “croaks” (per minute) increases What is the manipulated variable? What is the manipulated variable? What is the responding variable What is the responding variable VARIABLES

15. Those we try to Change (Cause) Independent Variable Manipulated Variable X variable Those we try to Change (Cause) Independent Variable Manipulated Variable X variable The result of the Change (effect) dependent variable responding variable Y variable The result of the Change (effect) dependent variable responding variable Y variable

16. Consider This: Will a house plant grow better in a warm room or a colder room What is going to be the manipulated variable? The Temperature of the Room VARIABLES

17. Consider This: Will a house plant grow better in a warm room or a colder room What is going to be the responding variable? Plant Growth VARIABLES

18. `` EXAMPLE: Lava from a Hawaiian volcano travels a 20 feet every minute What is the manipulated variable? What is the responding variable Time => distance VARIABLES

19. 1.Identify the problem being investigated 2. Identify the manipulated variable and the responding variable 3. Identify which one CAUSES the other one to change TIPS FOR IDENTIFYING VARIABLES VARIABLES

20. REVIEW Manipulated variable => responding variable independent variable => dependent variable “x” => “y” VARIABLES

21.  Class Handout Activity pg. 46: Controlling Variables  Graph Data Table VARIABLES

22. Homework: Internet Questions Finish a Graph of the Data Table