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This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable
• independent variable
• data
• control group

This experiment was set up to test the hypothesis that plants grow faster in green light.  What is the independent variable in the experiment

• amount of water
• type of plant
• color of light
• size of pot

Factors that do not change during an experiment

• dependent variables
• Independent variables
• controls
• constants

The part of the experiment being measured or observed; the data collected during an experiment

• independent variable
• dependent variable
• constant
• control

Kira wants to test which type of soda creates the biggest foam explosion when adding a Mentos candy.  She chose Sprite, Coke, and Mountain Dew.  One at a time, she added a single Mentos candy and measured the height of the foam eruption.  Mountain Dew created a foam eruption of 7 inches.  Coke and Sprite tied at 5 inches.  What is her dependent variable?

• Brand of soda
• number of mentos candies used
• height of foam eruption
• temperature of soda

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant
• The amount of sunlight
• The type of music
• The type of liquid

Mr. Fitch wanted to see how different types of music affected students' heart rates. He played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. Identify the independent variable.

• classical music resulted in the highest pulse rate

• types of music

• students' heart rate

• Mr. Fitch

Mr. Fitch wanted to see how different types of music affected students' heart rates. He played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. Identify the dependent variable.

• classical music resulted in the highest pulse rate

• types of music

• students' heart rate

• Mr. Fitch

How many variables do we want to be testing at one time?

• 1
• 2
• 3
• 4

Constants should be...

• different

• same

• kind of the same

• none of the above