biology 8-30

What is a control variable/constant?

• The variable that is changed/manipulated in the experiment

• The variable that is being observed/measured in the experiment

• Elements that are kept constant/unchanged in the experiment

• The group that does not receive the manipulation; used to compare

• The groups that do receive the manipulation

What is the test/independent variable in this experiment?

• The height of the plants

• The color of the lightbulbs

What is the outcome/dependent variable in this experiment?

• The height of the plants

• The color of the light bulbs

What is the control group in this experiment?

• The group with the red light

• The group with the white light

• The group with the blue light

• The group with the green light

Mrs. Sommers designs an experiment to see if the color of light will affect plant growth. What is her dependent variable?

• Color of Light

• How tall the plants grow

• Plant Type

• How long she runs the experiment for

Mrs. Sommers designs an experiment to see if the color of light will affect plant growth. What is her independent variable?

• Color of Light

• How tall the plants grow

• Plant Type

• How long she runs the experiment for

Molly investigated if the age of students caused them to be better drivers. What is the independent variable?

• Type of car
• Skill of driving
• Age of student

Sam wanted to know if the color of the chair you sat in when taking a test affected your test grade. What is the dependent variable.

• Color or chair
• Grade on test
• Age of students

Sarah wanted to find out if the size of a car tire made it a smoother ride over bumps. What is the independent variable?

• Size of tire
• How smooth the ride was over bumps
• Type of car

Penelope wanted to see if the temperature of the oven made cookies softer or harder. What is the independent variable.

• Hardness of cookie
• Type of oven
• Temperature of oven