1. The Scientific Method Practice

2. Variables The next two slides will have situations
List the variables from each situation

3. Situation One
1. The higher the temperature of the water, the faster the egg will cook

4. Situation Two
2. The time it takes to run a kilometer depends on the amount of exercise a person gets

5. Types of Variables
The variable that is deliberately chanced in an experiment is the INDEPENDENT VARIABLE
Identify the independent variable in the next two situations:

6. Independent:
3. The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead

7. Independent:
4. Lemon trees receiving the most water will produce the largest lemons

8. Types of variables
The variable that changes because of the experiment is the dependent variable
Identify both the independent and dependent variables:

9. Situation One
5. More bushels of potatoes will be produced if the soil is fertilized more
Independent?
Dependent?

10. Situation Two
6. An investigation was carried out to determine if the number of nails picked up by an electromagnet will be increased if more batteries are put in the circuit
Independent?
Dependent?

11. Situation Three
7. Five groups of rats are fed identical diets except each group gets a different amount of vitamin A. After three weeks on the diet, the rats are weighed.
Dependent
Independent