1. Catalyst – August [6(3)+8], 2009 Identify the independent variable, dependent variable, and control group in the following scenario: Dr. Anderson believes that eating artichokes can decrease cholesterol. Dr. Anderson recruited two sets of patients of equal age and health. She gave one group a normal diet and the other group an artichoke- filled diet. She then measured the patients’ cholesterol levels two weeks later.

2. Honors Catalyst – August [6(3)+8], 2009 Identify the independent variable, dependent variable, and control group in the following scenario: Ms. Aymami has told Higgins soccer players that they should also run cross country this fall. She thinks that if all the soccer players run cross country, then they will be in better shape for the soccer season in the winter.

3. Today’s Agenda Catalyst 4 th period only: IV/DV Notes Computer expectations Virtual Lab Demo Virtual Tomato Lab! Get connected with this class: Wiki/Twitter Exit Question HOMEWORK: Simpsons worksheet, STUDY FOR QUIZ!!!!!

4. Today’s Objectives SWBAT identify independent and dependent variables in a controlled experiment. (4 th ) SWBAT design a controlled emperiment with an independent and dependent variable.

5. (4 th only) Mystery Goo Hypotheses Let’s talk about the goo some more. What would have happened if we added more water? How would you test it? What would have happened if we added more corn starch? How would you test it?

6. Experimentation Key Point #1: A proper experiment always has an independent variable, dependent variable, and control group. Scientists will change one thing and measure something else. If Mr. Jhaveri wears his basketball shoes, then he will score more points in a game.

7. Variables Independent Variable: The thing that I change Basketball Shoes Dependent variable: The thing that is measured Points *Remember variables are always nouns!!

8. Good experiments… ONLY CHANGE 1 THING!! You must keep everything else constant, or your data may not be valid! Control Group: The group without the independent variable. What was the control group in the basketball experiment? IMPORTANT!!!

9. Practice Do older microwaves give off more radiation? What is the independent variable? IV = DV = Microwave Age Radiation

10. Practice Are there more love bugs in the summer or the winter months? What is the dependent variable? IV = DV = Season Amount of love bugs

11. Practice Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured. IV = DV = Age Puzzle Assembly Time

12. If there are more students, then there will be more school buses. IV = DV = Amount of students Number of school buses

13. If the cost of beignets increases, then fewer will be sold. What depends on what? IV = DV = Cost of Beignets Amount of Beignets sold

14. IV = Number of free agents DV = Games Won If the Saints sign more free agents, then they will win more games.

15. Foldables! First flap: Real-life scenario in hypothesis form Second Flap: Define and identify independent variable Third Flap: Define and identify dependent variable Fourth Flap: Define and identify control group

16. Foldables! First flap: If I use more minutes, then my cell phone bill will increase. Second Flap: DEFN, IV: number of minutes I use Third Flap: DEFN, DV: amount of my cell phone bill Fourth Flap: DEFN, Control group: number of minutes I usually use

17. Exit Question Identify the independent variable, dependent variable, and control group in the following scenario. Dr. Ayaad believes that eating artichokes can decrease cholesterol. Dr. Ayaad recruited two sets of patients of equal age and health and she gave one group a normal diet and another an artichoke-filled diet. She then measured the patient’s cholesterol 2 weeks later.

18. COMPUTER TIME One computer per 2 students. Respect these computers. Always tie up cords before walking. Do not use excessive force when opening up the computer. Be Patient!!! Respect the time. If I see you on another website without permission, you lose your computer privileges for the day and you will have an alternative assignment.

19. After you get your computer running… Go to this website: http://school.discoveryeducation.com/sciencefai rcentral/ http://school.discoveryeducation.com/sciencefai rcentral/ On the brown tabs on the lower left, click virtual lab. Then, hit get started. Click How Does Your Garden Grow Virtual Lab (Flash)

20. Exit Question Why is it important to have a control group in an experiment?