1. Controlling Your Science Fair Project

2. What needs to be controlled?
Project: The Effect of Drinking Orange Juice on Test Performance
Procedure: Give students orange juice, then have them take a math test.
Controls?

3. What needs to be controlled?
Project: The Effect of Drinking Orange Juice on Test Performance
Procedure: Give students orange juice, then have them take a math test.
Controls:
- Hydration (some have water instead, some have nothing)
- Amount of orange juice (Same amount? Based on weight?)
- Amount of time between juice and test must be same
- Test difficulty must be the same
- Must take into account/control the math abilities of the student

4. What needs to be controlled?
Project: Does talking on a cell phone decrease reaction time?
Procedure: Have participants talk to someone in another room on a cell phone. Test their reaction time by having them try to grab a ruler when you drop it.
Controls?

5. What needs to be controlled?
Project: Does talking on a cell phone decrease reaction time? Procedure: Have participants talk to someone in another room on a cell phone. Test their reaction time by having them try to grab a ruler when you drop it.
Controls:
- Take into account/control physical abilities (do they play sports?)
- Hands-free or hands-on cell phone? Try both! Keep track of which
one you are testing.
- Control person talking to participants (make all conversations equally
distracting or intense)
- Test every person the same number of times
- Complete all trials for a subject within same session

6. What needs to be controlled?
Project: Are people able to distinguish a real smile from a fake smile?
Procedure: Show participants images you created of people fake-smiling and real-smiling. Give participants a test with these pictures, and see how many they identify correctly.
Controls?

7. What needs to be controlled?
Project: Are people able to distinguish a real smile from a fake smile?
Procedure: Show participants images you created of people fake-smiling and real-smiling. Give participants a test with these pictures, and see how many they identify correctly.
Controls:
- Give all participants the same test
- Give all participants the same instructions/information
- Ensure all participants have good vision
- Make sure the test you make is accurate, or use an available test
to eliminate your personal bias