Variables in a Scientific Experiment

1. Variables in a Scientific Experiment

2. Controlled Experiment • Controlled Experiments have variables. • Variables are the things in an experiment that are or could be changed. • There are three kinds of variables.

3. Independent Variable • Also called Manipulated Variables. • This is changed by the scientist on purpose. • It is a single factor in an experiment that the scientist chooses to change. • It is the difference between groups. • The “cause” of a change. • When something is observed or changed over a period of time, then TIME is the independent variable.

4. Independent Variable Trick to Remember IChOP Independent Change On Purpose

5. Dependent Variable • Also called Responding Variable. • This responds to the Independent Variable changing. • It is the effect caused by the Independent Variable. • What is observed. • What is measured. • The data collected.

6. Dependent Variable Trick to Remember DRUM Dependent Response U Measure

7. Constant Variables • Things in an experiment that are kept the same. • They could change, but don’t. • Kept constant by the scientist. • Allow for a fair test.

8. Practicing Variables

9. Number 1 Changing your underwear every day may help you to feel more refreshed.

10. Number 2 Getting more dates would be likely if you start wearing deodorant.

11. Number 3 Brushing your teeth can reduce the chances of having bad breath.

12. Number 4 Having lots more friends can happen if you bring your sweaty gym clothes home for your mom to wash.

13. Number 5 Wearing a Speedo while swimming may take seconds off your breaststroke.

14. Number 6 To make your family happy, wear odor-eaters in your shoes.

15. Number 7 Passing gas on your 1st date will guarantee the loss of a second date.

16. Number 8 Flossing your teeth with your toenail will make your sister vomit.

17. Copy this template into page ____ of your journals.