A group of student researchers want to test the impact of temperature and lighting on the amount of food laboratory rats will eat.

To do this, they will first vary the room temperature (Hot or Cold) and see how much the lab rats eat at each temperature.

They will then vary the lighting (On or Off) and see how much the lab rats eat during each lighting state.

Which of the following is the Dependant Variable?

Which of the following represents a continuous variable?

A hair care company is testing a new shampoo formula for its ability to keep hair clean for longer thanks to a new chemical compound XYZ that should limit oil production.

To test the appropriate strength of the shampoo, they are testing several concentrations of chemical XYZ to and measuring the amount of oil on the participant's scalp after 24 hours. The color of the shampoo will be randomly changed to keep the participants from knowing what shampoo is which strength.

Which of the following is the Dependant variable?