2. Observation Inference Variables Problem Statement or Purpose IV DV Levels of IV Units of Measurement Constants Hypothesis Materials Procedure Data Data Table Graph Conclusion Experimental Design Diagram Background Information

3. Variables and Constants Variables - things that change - 2 types are: independent dependent

4. Independent Variable (IV) -ONE thing you change on purpose -I “Vill” change this… -Example : You have a metal coffee cup and a paper coffee cup. You want to see which one stays the hottest after 5 minutes. the IV is - type of coffee cup

5. Levels of IV-Description of “set-ups” -The levels of IV in our coffee cup experiment are: metal coffee cup paper coffee cup

6. Dependent Variable (DV) -what you measure -Did you measure Very carefully? -the DV in our coffee cup experiment is: Temperature of coffee -Units of Measure: Use metric Pick units that fit your experiment

7. Constants Things that stay the same Keeps the experiment fair. Why do you need constants? Good Examples: Starting Temp of Coffee Experiment Time Volume of Coffee Not So Good Examples: Timer Thermometer Summary: The difference between the IV and the DV is… Constants are important because…

8. Practice Does the amount of sugar in soda (diet soda vs regular soda) affect the number of cavities you get? IV: _______ ___ _________ Levels: _________________ _________________ DV: _______ ___ _________ Constant: ____________________

9. Practice Does the length of a plane wing (3 cm, 5 cm and 7 cm) affect the distance it flies? IV: _______ ___ _________ Levels: _________________ _________________ DV: _______ ___ _________ Constant: ____________________

10. Practice Does the age of a basketball (brand new, 2 months old, 4 months old) affect how high it bounces? IV: _______ ___ _________ Levels: _________________ _________________ DV: _______ ___ _________ Constant: ____________________

11. Practice Does putting a plant under red, green, or blue light make it grow taller? IV: _______ ___ _________ Levels: _________________ _________________ DV: _______ ___ _________ Constant: ____________________

12. Observation: Bug has 3 antennae Inference: Bug is a mutant! IV: amount of chemical Levels of IV: 1 dose, 2 doses, 3 doses DV: Time to lose extra antannae Units of Measurement: days Constants: type of chemical type of bug