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Identifying Variables

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**1. **Identifying Variables

**2. **What is a Variable? A variable is a factor or condition that can change in an experiment.

**3. **Case Study Variables are used in algebra
Stands for an unknown
Can change with solving the equation

**4. **3 Types of Variables
Manipulated (Independent) variable
Responding (Dependent) variable
Controlled variable

**5. **Manipulated Variable Also called Independent Variable – a factor or condition that is intentionally changed by an investigator
What is tested
What is manipulated
What is changed

**6. **Responding Variable Also called Dependent Variable – a factor or condition that might be affected as a result of that change
What is observed
What is measured
The data collected during the investigation

**7. **Controlled Variables A variable that is not changed
Also called constants
Allow for a “fair test”

**8. **For Example:

**9. **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.

**10. **Identify the variables in this investigation.

**11. **What was the manipulated variable? Ages of the students
Different ages were tested by the scientist

**12. **What was the responding variable? The time it took to put the puzzle together
The time was observed and measured by the scientist

**13. **What was a controlled variable? Same puzzle
All of the participants were tested with the same puzzle.
It would not have been a fair test if some had an easy 30 piece puzzle and some had a harder 500 piece puzzle.

**14. **Another example:

**15. **The higher the temperature of water, the faster an egg will boil.

**16. **Manipulated variable – temperature of water
Responding variable – time to cook an egg
Controlled variables – type of egg, amount of water, heat source

**17. **Last one:

**18. **The temperature of water was measured at different depths of a pond.

**19. **Manipulated variable – depth of the water
Responding variable – temperature
Controlled variables – thermometer, pond