Independent and Dependent Variables

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

• Dependent variable: p

• Dependent variable: t

What is the independent variable in the statement?

• Independent variable: p

• Independent variable: c

What is the independent variable in the statement?

• Independent variable: w

• Independent variable: p

A vacationer has $300 to spend over the next 20 days. The first two days, she spends $20 on food each day. She visits with a family member for the next four days and does not spend any money. She then spends $20 on transportation on each of the remaining days until she spends all of her money. 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 ___________

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

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

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

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