1. August 24, 2009  Catalyst  Over the weekend, Andreas lost his new iPhone. Today, Courtney came to school with a brand new iPhone. As you walked to class, you overheard Courtney whispering to someone about how “lucky” she was to “win” something, but you could not make out anything more.  Write a hypothesis about how you think Courtney got her new iPhone.

2. Objectives  By the end of class, SWBAT…  Make quality hypotheses  Test a hypothesis in an experiment

3. Catalyst Review  So, what do you think happened?

4. Hypotheses are EDUCATED guesses  A lot of students have had trouble understanding when a hypothesis is educated, and when it is not.  From now on: always include the word “because” in your hypothesis.  A hypothesis is educated if there is a reason to believe it.  If you write “because” then you are supplying a reason, so your hypothesis will ALWAYS be educated.

5. Go back to your catalyst  Re-write your hypothesis using the word “because”

6. Stroop-a-doop  Read the “Procedures” section of the Stroop lab to yourself  When you finish, write a hypothesis

7. Stroop-a-doop: Roles  In this lab, there are 4 positions:  Time Keeper  Test Subject  Test Proctor  Signal Giver  Each person will get an opportunity to be each role!

8. Stroop-a-doop: Let’s model this  I need one group to volunteer

9. Matching Color RED BLUE YELLOW GREEN RED

10. Non-Matching Color RED BLUE YELLOW GREEN RED

11. Stroop-a-doop: Let’s model this  Answer the pre-lab questions (questions 1-2)

12. Group Chat  What was the independent variable?  HINT: What did I change?

13. Group Chat  What was the dependent variable in this lab?  HINT: What did I measure?

14. Group Chat  Was there a control in this experiment? Why was it necessary?

15. Independent time  Each person must turn in a lab report on the Stroop experiment.

16. Exit Questions  Write a hypothesis to explain whether you think young people or old people would be faster at reading non- matching words in the Stroop lab.  Keep in mind what we learned earlier about how to write educated hypotheses!