6. Students measured the temperature of the water at different depths in Lake | Skywalker and found that the temperature varied.

Independent variable: Dependent variable:
Constant:

1.

I: Type of tire tread

D: Breaking Distance

C: Model of car, material of road

2.

I: Person’s running speed

D: Time to run one mile

C: Distance of run (one mile)

3.

I: Amount of water

D: Height of bean plants

C: Soil type, amount of sunshine

4.

I: Temperature of oven

D: Time it takes for cake to bake

C: Batter, baking tin

5.

I: Amount of water

D: Amount of lemons

C: Soil type, environment, nutrients

6.

I: Amount of fertilizer

D: Amount of potatoes

C: Soil type, environment, amount of water

7:

I: Depth of lake

D: Temperature

C: Time of day, day of year

8.

I: Amount of lead in gasoline

D: Amount of pollution emitted

C: Amount driven by each car

9.

I: Amount of Vitamin A

D: Difference in weight

C: Other nutrients in diet, time elapsed between measurements

Explanation:

The independent variable is the thing in the experiment that the researcher changed. The dependent variable is the thing in the experiment that changes as a result of differences between the independent variable.

The controls are things that do no change between all variations of the experiment.