Identifying Variables

Identifying Variables PowerPoint PPT Presentation

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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

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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

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