Copy of How to Design an Experiment

What is a hypothesis?

• A question that you are investigating

• A suggested testable explanation (answer) for the phenomenon

Why is a control group important?

• It is used to see if the experimental group causes a change.

• It changes all the time, allowing us to see if the experimental group stays the same

How many independent variables should there be in an experiment and what is it in this experiment?

• 1

• 2

• 3

What are constants in an experiment?

• The variables you change.

• The variables you keep the same.

In this example:

"A bug repellant is sprayed on one arm the other arm is not sprayed. The number of bug bites is recorded after 2 hours."

What is the dependent variable?

• 2 hours

• Number of bug bites

• Bug spray/no bug spray

In this experiment:

"One chicken is injected with a growth hormone while another chicken is not injected. Both chickens are weighed after a year."

What is the independent variable?

• Growth hormone

• Weight of chickens

What variable goes on the x-axis?

• Dependent Variable

• Independent Variable

What variable is known as the data that you are collecting?

• Dependent Variable

• Independent Variable