Variables

Research Question: 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

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the independent variable.

• distance traveled by the ball
• height of the ramp
• mass of the ball
• weight of the ball

Research question: does the distance a person kicks a soccer ball effect how well they will do on their math test.  What is the dependent variable?

• How far they kick the soccer ball
• who the person is
• how well they do on the math test
• Type of soccer ball.

What is the DEPENDENT variable (effect) in this experiment?

"Does eating breakfast improve test scores?"

• eating breakfast or not

• the grade you got on the test

• what time you get up in the morning

• how tasty the breakfast is

You are testing how the amount you water a plant affects its growth. What would be the INDEPENDENT VARIABLE in this experiment.

• They type of pot you put the plants in.

• The amount you water each plant.

• The amount of sunlight the plants get.

• The amount the plant grows.

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

A student wants to test the hypothesis of "If salt is added to water then the boiling point of water will decrease (go down)." What is the independent variable?

• Whether salt is added or not

• Boiling Point

• Amount of water

Yaara wants to determine if amount of fertilizer impacts grass growth

What is the Dependent Variable?

• amount of fertilizer

• type of fertilizer

• grass growth

• type of grass

The parts of the experiment that must be kept the same.

• Constants
• Independent variable

• Dependent variable

• Conclusion

Thomas tests different types of liquids to see which will grow his plants the most. He has water, soda, milk, and no liquid at all. What is the control group?

• the one with water

• the one with soda

• the one with milk

• the one with no liquid