Independent and Dependent Variables

a variable whose variation does not depend on that of another.

• independent variable

• dependent variable

• control variable

a variable whose value depends on that of another.

• independent variable

• dependent variable

• control variable

variable represented on the x-axis

• independent variable

• dependent variable

• control variable

variable presented on the y-axis

• independent variable

• dependent variable

• control variable

George wants to know if different colors of light will affect plant growth. He puts plants under different colors of light and measures their height for 2 months. What is the Independent Variable?

• light color

• plant growth

• amount of light

• type of plant

George wants to know if different colors of light will affect plant growth. He puts plants under different colors of light and measures their height for 2 months. What is the Dependent Variable?

• light color

• plant height

• type of plant

• type of soil

Lucy wanted to see if her goldfish released more ammonia when give tropical fish food or goldfish food. She separated her 30 goldfish into two groups and put them in separate tanks for this experiment. She then measured the ammonia content in each aquarium for 6 weeks. What is the Independent Variable?

• content of ammonia

• number of goldfish

• type of food

• length of experiment

Lucy wanted to see if her goldfish released more ammonia when give tropical fish food or goldfish food. She separated her 30 goldfish into two groups and put them in separate tanks for this experiment. She then measured the ammonia content in each aquarium for 6 weeks. What is the Dependent Variable?

• content of ammonia

• size of fish

• type of food

• number of fish

The more time people spend using social media, the less they read books. What is the independent variable?

• time on social media

• time on books

• number of books read

• type of books read

Where only the independent variable has been allowed to affect the dependent variable.

• fair test

• reliable test

• null test