1. How do scientists begin an investigation? By asking a question.

2. You observe that a child grows 2 cm over a six- month period. This type of information is called: Quantitative data (you can count it).

3. You suggest that more traffic accidents occur when it rains. This is an example of a(n): Hypothesis (possible idea, not yet proven).

4. A scientist thinks that flowers will grow faster if a tablet of aspirin is placed in the soil. How should he test this idea? Grow one plant with aspirin, and grow the other plant without aspirin. Control all other variables, such as type of plant, amount of light, and water.

5. What was NOT a controlled variable in Redi’s experiment? The gauze covering (this was the manipulated variable).

6. How many variables are changed in a controlled experiment? ONE variable is changed (the manipulated variable.)

7. What happens to a hypothesis when it is supported by enough experiments? It becomes a theory.

8. What is a hypothesis based on? Background research.

9. In a weight-loss experiment, the subjects’ satisfaction with their body is an example of what type of data? Qualitative data (it can’t be counted).

10. What was the responding variable in Redi’s experiment? The appearance of maggots.

11. What are conclusions based on? Conclusions are based on data.

12. In an experiment, what is the name of the variable that is deliberately changed? The manipulated variable.

13. If a scientist concludes that their hypothesis is incorrect, which step of the scientific method should they return to? Step 3 (they need a new hypothesis!)