Independent & Dependent variable

Research question: Does the distance a person kicks a soccer ball effect their grades on their math test.  What is the dependent variable?

• How far they kick the soccer ball
• who the person is
• their math test scores
• Type of soccer ball.

When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, equal amount of light, and equal water. What type of variable is the fertilizer?

• Dependent
• Independent
• Control
• Compound

Which variable depends on what is done at the beginning of an experiment?

• Dependent
• Independent
• Control
• Following

What would the INDEPENDENT variable be in an experiment testing which types of paper airplane goes furthest?

• the paper used
• the type of paper airplane
• the distance of each plane's flight
• how hard the plane is thrown

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

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

Steven set 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
• Who set up the experiment (Ms. S, etc)

Ms. Stowe set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the responding variable.

• Distance traveled by the ball
• Height of the ramp
• Mass of the ball
• Where the experiment took place.

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.

How many independent variables can be tested in a controlled experiment?

• one
• two
• three
• as many as possible