1. Experimental Definitions

2. What is a Variable? Something that changes in an experiment Examples:
Amount of light or water
Type of soil
Speed of an object
Grades
Growth

3. The Independent Variable (Hint: Think CAUSE)
The variable that you change on purpose
Sometimes called the manipulated variable

4. Examples of Independent Variables
Amount of light or water
Type of soil
Height of the ball drop

5. The Dependent Variable (Hint: Think EFFECT)
The variable that changes/responds to the independent variable
It is the variable that you measure in the experiment
Sometimes called the responding variable

6. Examples of Dependent Variables
Speed of an object
Height/growth of a plant
Distance traveled
Grades

7. Constants
Details in the experiment that do not change from trial to trial.

8. Examples of Constants Same type of seed (plant) Same size dropper
Same amount of time

9. Control
A standard for comparison in an experiment…sometimes called a placebo

10. Examples of Controls Plant that received no water or no light
Patient who received a “sugar” pill (placebo)