1. Monday, September 12, 2011
Please follow the procedure for entering the classroom.
Copy today’s “I can” statement.
Fill out your agenda.
Remember CHAMPs expectations.
Thank you!
C: 0 H: quietly ask your elbow partner; after bell, raise your hand to ask Ms. Edgington A: Complete bellringer tasks M: 0 (once you sit down!) P: silently completing tasks

2. Step 2: Form a Hypothesis
Hypothesis: an educated guess or prediction that can be tested; an “if, then” statement
If ____independent variable______
then__dependent variable_______

3. Types of Variables There are 2 main types of variables:
Independent Variable: The variable that is changed by the scientist; the ‘I control’ variable
Dependent Variable: The variable that might change because of what the scientist changes – what is being measured

4. Complete Packet Today!
You may work independently or with one or two partners.
You may sit where you wish in the room (except not beyond the sink)
Remember expectations (on the board)

5. Identifying Variables

6. Remember! Your hypothesis can TELL you what your variables are!
Ex. If I drink Mountain Dew before bed, then I will not sleep very much.
IV: Drinking Mountain Dew
DV: the amount of sleep

7. If I brush my cat more, then there will be less fur on my furniture
IV: ______________________
DV: ______________________

8. Now read the following experiment and identify the independent and dependent variables
Elizabeth wanted to test if temperature affected how fast milk goes bad and curdles. She left milk in a room temperature closet, a fridge, and a oven that was turned on low heat. She then measured how rotten the milk was after 10 days.
IV: ____________________________________
DV: ____________________________________

9. Hypothesis

10. Example: Independent Variable: I feed my cat a lot of food
she will get fat
If ___________________________
then _________________________

11. Try to use INCREASE and DECREASE in your hypothesis!
Remember
Try to use INCREASE and DECREASE in your hypothesis!
Ex. IF I increase the amount of food I give my cat, THEN she will increase her weight

12. Now Try it on Your Own! (2nd page in packet)
‘Writing a Good Hypothesis”
Just ‘plug and chug’ in your variables!

13. Constants and Controls

14. Constant
Constant: something that scientist makes sure is the same throughout the experiment
Ex. Watering the plants the same amount of water or making sure you are testing the same person every time

15. Control
Control: The part of the experiment that the scientist doesn’t change or add the variable to
Ex. The plant with the white light

16. Conclusion
The results of the experiment; is your hypothesis “right or wrong”?

17. Smithers Control: Group B
Independent Variable: recipient of special juice
Dependent Variable: stacks of papers
Conclusion: The special juice does not increase the productivity of workers.
Improvements:

18. Homer Observation: shower is covered in green slime
Control: water side
Independent Variable: coconut juice side
Dependent Variable: appearance of the green slime
Conclusion: Coconut juice does not get rid of the green slime.

19. Bart Control: mice not exposed to radiowaves
Independent Variable: Exposure to radiowaves
Dependent Variable: Strength
Conclusion: Exposure to radiowaves may have an impact on allowing mice to become stronger.
Improvements:

20. Krusty Control: old itching powder
Independent Variable: Experimental itching powder
Dependent Variable: amount of time itching
The data does support the advertisement claims about the products.

21. Ender
Tell me one thing you know FOR SURE that relates to today’s “I can” statement.