The passage below describes an experiment. Read the passage and think about the variables that are described.    

Which of the following was an independent variable in this experiment?

Hint: An independent variable is a variable whose effect you are investigating. A dependent variable is a variable that you measure. 

The passage below describes an experiment. Read the passage and think about the variables that are described.   

The passage below describes an experiment. Read the passage and think about the variables that are described.  

Which of the following was an independent variable in this experiment?
Hint: An independent variable is a variable whose effect you are investigating. A dependent variable is a variable that you measure.

The passage below describes an experiment. Read the passage and think about the variables that are described.   

Which of the following was a dependent variable in this experiment?
Hint: An independent variable is a variable whose effect you are investigating. A dependent variable is a variable that you measure.

The passage below describes an experiment. Read the passage and think about the variables that are described.