Identifying Variables

The ___ variable is what changes in an experiment.

• Controlled

• Independent

• Dependent

All variables in an experiment must be changed.

• True

• False

A ____ variable remains constant, or does not change.

• Controlled

• Independent

• Dependent

A study was done to find if different tire treads affect the braking of a car. What is the independent variable?

• Car

• Brakes

• Tire treads

• Seat belts

Lemon trees receiving the most water produced the most lemons. What is the dependent variable?

• Amount of water

• Growth of the lemon tree

• How many lemons were produced

• Amount of sunlight

The height of bean plants depend on the amount of water they received. What is the independent variable?

• Amount of water

• Height of the plants

• How many beans were produced

• Temperature the plants were in

The higher the temperature of air in the oven, the faster a cake will bake. Which is a controlled variable?

• Type of oven used

• Type of cake used

• The temperature

• Time for cake to bake

The dependent variable depends on the controlled variables.

• True

• False

The ____ variable is what is observed during the experiment.

• Independent

• Dependent

• Controlled

The temperature of water was measured at different depths in a pond. The temperature of water is the dependent variable.

• True

• False