Dependent and Independent Variables

What is the dependent variable in the statement? Surface area of walls in a room, a, and the amount of paint used, p

• Dependent variable: a

• Dependent variable: p

What is the independent variable in the statement? The number of pages read, p, and the time spent reading, t

• Independent variable: p

• Independent variable: t

A city discovers that its population has been tripling every year. The dependent variable in this scenario is __________

When Jane exercises on an elliptical machine, her initial heart rate is 90 beats per minute. She warms up at this rate for 5 minutes. Over the next 5 minutes, she gradually increases to 150 beats per minute. She maintains that rate for 15 minutes before gradually decreasing back to her original heart rate at the end of her 30-minute workout. The dependent variable in this scenario is ___________

One chicken is injected with a growth hormone while another chicken is not injected with a growth hormone. After one year, both chickens are weighed. What is the independent variable?

• If a chicken was injected with a growth hormone or not

• The weight of the chicken

• The type of chicken

The number of oranges in a bag and the cost of the bag of oranges are related. What is the independent variable in this relationship?

• The number of oranges in the bag

• The cost of the bag

Sarah is bringing treats to her elementary school class on her birthday. The number of treats she brings in is based on the number of students in her class.
t = the number of treats
s = the number of students
Which of the variables is independent?

• s = the number of students

• t = the number of treats

One chicken is injected with a growth hormone while another chicken is not injected with a growth hormone. After one year, both chickens are weighed. What is the dependent variable?

• If the chicken was injected with a growth hormone or not

• The weight of the chicken

• The type of chicken

Identify the independent variable

The number of hours, h, worked and the amount of money, m, earned

• hours, h

• money, m

Identify the independent variable

The pages p, in a book and the weight, w, of the book

• p

• w