Types of Variables

This variable is the one thing that is changed on purpose...

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

How many independent variables are allowed to be changed in an experiment?

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?

Mr. Pransky wants to see how different surfaces affect how high a tennis ball can bounce. What is the independent variable?

These are the variables that should stay the same. They do not get any changes in order to make for a fair test.

The variable that is being tested, counted, or measured and how it reacts to the independent variable is known as:

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

"Do tall people jump further than short people?"

Sadie is testing how the age of a seed affects how fast plants grow. Look at the picture to see if you can figure out what makes her experiment unfair. Mark all that apply.

A scientist is testing which flavor of ice cream melts the fastest. What would his controlled variables be? (choose ALL that apply)

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

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

"Does eating breakfast improve test scores?"