Experiments require an independent variable that is changed by the experimenter, a dependent variable that is measured and can change in response to the independent variable, and controlled variables that are kept constant by the experimenter to isolate the effect of the independent variable on the dependent variable. The independent variable is physically altered, the dependent variable is observed and measured, and controlled variables are not allowed to change to accurately assess the impact of changes to the independent variable.

1. EXPERIMENTS
and SCIENCE

2. What do good
experiments need?

3. Independent Variable

4. Independent Variable

5. Independent Variable
+

6. Independent Variable
+ + it

7. Independent Variable
+ + it
I change it

8. Independent Variable
+ + it
YOU physically change
I change it this variable

9. Dependent Variable

10. Dependent Variable

11. Dependent Variable
+

12. Dependent Variable
+

13. Dependent Variable
+
Yaw, dee
measurement

14. Dependent Variable
+
Yaw, dee
measurement
YOU measure and/or observe this variable

15. Controlled Variable

16. Controlled Variable

17. Controlled Variable
+

18. Controlled Variable
+ + it

19. Controlled Variable
+ + it

20. Controlled Variable
+ + it
YOU control it and
prevent it from changing