1. Three Types of Variables
Independent (Manipulated)- What we change.
Dependent (Responding) – What changes in response to the independent variable.
Constant- What stays the same.

2. If we change independent variable, then dependent variable will increase/ decrease/not change because…
DRY
MIX
Dependent (y-axis)
Independent (x-axis)

3. For Example:
Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle. Identify the variables in this investigation.
Independent Variable ::
Dependent Variable ::
Constant Variable ::

4. Another Example
An investigation was done with an electromagnetic system made from a battery and wire wrapped around a nail. Different sizes of nails were used. The number of paper clips the electromagnet could pick up was measured. Identify the variables in this investigation.
Independent Variable ::
Dependent Variable ::
Constant Variable ::

5. Example #3
The higher the temperature of water, the faster an egg will boil. Identify the variables in this investigation.
Independent Variable ::
Dependent Variable ::
Constant Variable ::

6. Example #4
The temperature of water was measured at different depths of a pond. Identify the variables in this investigation.
Independent Variable ::
Dependent Variable ::
Constant Variable ::