Identify Controls and Variables KEY

***Students will be asked to state

the hypothesis for each experiment.

SMITHER’S—

Hypothesis: The special juice will increase productivity

1. Group B

2. independent variable—special juice

3. dependent variable—number of stacks

4. The special juice does not increase productivity.

5. Answers will vary.

HOMER’S—

Hypothesis: Coconut juice will get rid of green slime in the shower.

6. the shower covered in green slime

7. ½ shower with water

8. independent variable—coconut juice

9. dependent variable—green slime

10. Coconut juice does not get rid of slime.

BART’S—

Hypothesis: Exposure to microwaves will increase the strength of the mice.

11. non-exposed mice

12. independent variable—microwaves (or exposure)

13. dependent variable—strength of the mice

14. slight increase—repeat the experiment

15. Answers will vary.

KRUSTY’S—

Hypothesis: The new itching powder lasts longer than the original powder.

16. Subject A (original powder)

17. independent variable—new itching powder

18. dependent variable—how long the itching lasts

19. Yes, it supports the data. (50% of 30 = 15 AND 30 + 15 = 45)

LISA’S—

Hypothesis: Rogooti will increase the speed of hair growth.

20. Answers will vary.

Example:

Bart = experiment independent variable = “Rogooti” (hair product) Homer = control dependent variable = hair growth of family members