Variables

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, what is the dependent variable?

• Type of plant
• Water, apple juice, milk
• Plant growth
• Color of the plant's leaves

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 amount of liquid

• The type of liquid

Maria wants to know if birds prefer to eat in one place over another. She makes three feeders out of 2-liter bottles and paints all of them red. She fills each of the feeders with the same amount of mixed birdseed, and plans to keep the feeders out for 10 days before measuring how much seed is eaten from each feeder. She puts each of the feeders in her back yard: one feeder in a large dead tree, another feeder she sits on the dog house, and the last she sits in a small bushy tree.
What is the dependent variable?

• Length of the birdfeeders
• Amount of time feeders are outside
• Amount of seed eaten
• Location the feeders are put in.

Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the independent variable

• Type of fertilizer

• Size of sunflower

• Type of flower

• Amount of fertilizer

Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the dependent variable

• Type of fertilizer

• Size of sunflower

• Type of flower

• Amount of fertilizer

Does the type of gasoline put in a car effect how fast the car can drive. What is the independent variable?

• Type of gasoline

• which car the gas is put into

• how fast the car can drive

• how much gas is put into the car

Experiment: How does watching TV during studying affect a student’s test grades?

The students grades are the ___________ variable.

• independent
• dependent

Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the controlled variable

• Type of fertilizer

• Size of sunflower

• Amount of fertilizer

What two words should be in your hypothesis?

• I think

• If ...then...

• It will

• No idea

Which hypothesis is correctly written?

• I think I will do well on my test today, because I ate a good breakfast.

• If I eat a good breakfast, then I will do well on my test today.

• If I eat a good breakfast, then I will earn a passing grade on my test today.

• If I do well on my test today, I get to out to eat for breakfast.