Growth Hormone

Independent vs Dependent Variables

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Multiple Choice

A cow is given a growth hormone and then compared to another cow that was not given a growth hormone. Both cows were weighed at 2 years. What is the INDEPENDENT variable?

• amount of time

• weight

• growth hormone

• type of cow

The independent variable is the growth hormone.

Remember that the independent variable is the one that we change on purpose. In this case, we give one cow growth hormone and the other gets no growth hormone.

Multiple Choice

A cow is given a growth hormone and then compared to another cow that was not given a growth hormone. Both cows were weighed at 2 years. What is the DEPENDENT variable?

• amount of time

• weight

• growth hormone

• type of cow

The dependent variable is the weight of the cow.

Remember that the dependent variable is the variable we measure (it DEPENDS on the other variable). In this case, we are measuring the weight of the cow to see if the growth hormone has affected it.

Control Variables

Some variables in this experiment are kept the same:
- Time (2 years)

- Type of cow
- Environment
It is important to keep all variables except the independent variable the same to get accurate results.

Multiple Choice

Mosquito repellent is sprayed on one arm and the other arm is not sprayed. The number of mosquito bites is counted after 2 hours.

What is the INDEPENDENT VARIABLE?

• which arm

• mosquito repellent

• time

• number of mosquito bites

Mosquito repellent is the independent variable.

We are changing whether the arm gets sprayed with mosquito repellent or not.

Multiple Choice

Mosquito repellent is sprayed on one arm and the other arm is not sprayed. The number of mosquito bites is counted after 2 hours.

What is the DEPENDENT VARIABLE?

• which arm

• mosquito repellent

• time

• number of mosquito bites

Number of mosquito bites is the dependent variable.

We want to see if the bug repellent affects the number of mosquito bites on a person's arm.

Control Variables

- Person who is sprayed
- Environment
- Time (2 hours)

Now, use the information below to complete the independent vs. dependent variable practice.

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