Independent, Dependent, and Control Variables

The variables in an experiment that stay the same are the - 

• Independent variables

• Dependent variables

• Control variables

The one factor that a scientist changes during an experiment. (It affects the results of the experiment).

• Controlled Variable

• Dependent Variable

• Independent Variable

This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable

• independent variable

• data

• control group

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

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-7

Ruthie has a pet goldfish. After several months the goldfish quits growing. Ruthie’s Mom told her the goldfish might have stopped growing because the tank is too small. Ruthie measures the size of her goldfish in its current tank, and then puts the goldfish in a larger tank. After 2 months the goldfish is now 1cm longer.

What is the Independent Variable?

• Length of the Goldfish

• Color of the Goldfish

• Size of the fish tank

• 2 months

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Heidi is a chocolate lover and eats chocolate daily. She has a bad break-out and her friend told her eating chocolate causes pimples. Heidi continues to eat chocolate every day for 2 weeks and counts the number of pimples she has on her face. The following 2 weeks she doesn’t eat any chocolate and counts the number of pimples on her face.

What is the Independent Variable?

• 2 weeks NOT eating chocolate

• 2 weeks eating chocolate

• Number of pimples

• How much sleep Heidi gets.

Tags

NGSS.MS-LS1-5

Heidi is a chocolate lover and eats chocolate daily. She has a bad break-out and her friend told her eating chocolate causes pimples. Heidi continues to eat chocolate every day for 2 weeks and counts the number of pimples she has on her face. The following 2 weeks she doesn’t eat any chocolate and counts the number of pimples on her face. What is the Independent Variable?

• 2 weeks NOT eating chocolate

• 2 weeks eating chocolate

• Number of pimples

• How much sleep Heidi gets.

Mark notices he has dropped calls on his cell phone when he walks into his bedroom. His friend told him to try and wrap aluminum foil around his phone to get better signal. Mark talks on the phone 3 times while walking into his bedroom and drops 2 of the 3 calls. He wraps his phone in aluminum foil and talks on the phone 3 more times while walking into his bedroom. With the aluminum foil on his phone he only drops 1 phone call.

• Wrapping the phones in foil

• Independant Variable

• 3 calls made without aluminum foil.

• Dependent Variable

• Number of dropped calls

• Control

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

In the statement, Citronella leaf extract repels dengue-carrying mosquitoes, what is the independent variable?

• extract of citronella

• duration of the study

• repelling action of the extract

• dengue-carrying mosquitoes

Ruthie has a pet goldfish. After several months the goldfish quits growing. Ruthie’s Mom told her the goldfish might have stopped growing because the tank is too small. Ruthie measures the size of her goldfish in its current tank, and then puts the goldfish in a larger tank. After 2 months the goldfish is now 1cm longer. What is the Independent Variable?

• Length of the Goldfish

• Color of the Goldfish

• Size of the fish tank

• 2 months

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1