The Scientific Method Practice

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

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

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

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:

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

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

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

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

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?

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