Independent Variable
What effect does decreasing the temperature of a room have on a lifespan of a battery? Which variable is italicized?
What is independent variable
Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.
What is the dependent variable?
Amount of time it takes the helicopter to hit the floor
Angelina performed an investigation to find out how the concentration of salt water affected the hatching of brine shrimp. What is the INDEPENDENT Variable?
Salt water concentration
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, same amount of sunlight, and the same amount of liquid. In this investigation, the dependent variable is
growth of the plant
David performed an investigation to find out how temperature affects crystal growth. What is the INDEPENDENT Variable?
Temperature
Jessie is concerned about how tired his classmates seem. He created a drink that he thinks will boost their energy. He recruits 100 classmates with a history of tiredness. He has 50 of them drink his new special energy drink. The other 50 drink a beverage that looks like the special energy drink, but is just water and food coloring. Both groups were told that they were getting the special drink that would boost energy. After 2 hours, 30 classmates in the first group reported having more energy and 8 classmates in the second group reported having more energy.
What is the dependent variable?
amount of energy
Kira wants to test which type of soda creates the biggest foam explosion when adding a Mentos candy. She chose Sprite, Coke, and Mountain Dew. One at a time, she added a single Mentos candy and measured the height of the foam eruption. Mountain Dew created a foam eruption of 7 inches. Coke and Sprite tied at 5 inches. What is her independent variable?
type of soda
How does watching TV during studying affect a student’s test grades? Which variable is italicized?
dependent variable