What is a Variable?. A variable is a factor or condition that can change in an experiment.. Case Study. Variables are used in algebraStands for an unknownCan change with solving the equation. 3 Types of Variables. Manipulated (Independent) variableResponding (Dependent) variableControlled vari
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
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