Definitions
What is the independent variable?
The IV is what I change in an experiment
What is the IV for this experiment:
How does the color of the cup affect the temperature of the water?
color of the cup
What is the DV for this experiment:
How will the different tire treads affect the braking speed?
braking speed
Find a control in this experiment:
Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured.
same puzzle
How many Levels of the IV in this experiment:
A cube of sugar was dissolved in 500 mL of cold water, room temperature water, and hot water. We timed how long it took for each sugar cube to dissolve.
3 levels
What is the dependent variable?
The DV is the Data collected -- what I measure
What is the IV for this experiment:
If the oven temperature is higher, then the baking speed will be faster.
oven temperature
What is the DV in this experiment:
George wanted to know if the brand of running shoe affected his mile time.
mile time
What should be a control in this experiment:
The temperature of water was measured at different depths of a pond.
same pond
How many Levels of the IV in this experiment:
Joe thinks that the farther a ball drops, the higher it will bounce. He tests this by dropping a ball from 2 feet off the ground, 4 feet off the ground, and 6 feet off the ground.
3 Levels
What is a control?
It is something that is kept the same throughout an experiment
What is the IV for this experiment:
How does the amount of salt affect the boiling point?
amount of salt
What is the DV for this experiment:
How does the size of the tank affect the size of the goldfish?
size of the goldfish
What could be a control in this experiment:
The greater the amount of soap in a soap and water mixture, the bigger a soap bubble can be blown.
type of soap
How many Levels of the IV in this experiment:
Judy wonders if an egg will weigh more when it's raw or when it's boiled.
2 Levels
What does "Levels of the IV" mean?
The Levels of the IV are all the different ways the IV is being changed
What is the IV for this experiment:
How does the temperature of the liquid affect the viscosity (thickness) of the liquid?
temperature of the liquid
What is the DV in this experiment:
Haley wondered if the amount of water given to a lemon tree affected the number of lemons that grew.
number of lemons
What could be a control in this experiment:
If the oven temperature is higher, then the baking speed will be faster.
item being baked
What are the Levels of the IV in this experiment:
A cube of sugar was dissolved in 500 mL of cold water, room temperature water, and hot water. We timed how long it took for each sugar cube to dissolve.
cold water, room temperature water, and hot water
How many controls should you have in an experiment?
At least 3 controls
What is the IV for this experiment:
How does the amount of studying affect the test score?
amount of studying
What is the DV in this experiment:
The greater the amount of soap in a soap and water mixture, the bigger a soap bubble can be blown.
size of soap bubble
What are TWO controls that could be in this experiment:
How does the size of the tank affect the size of the goldfish?
type of goldfish, number of fish in the tank, temperature of the water, amount of food given
What are the Levels of the IV in this experiment:
Joe thinks that the farther a ball drops, the higher it will bounce. He tests this by dropping a ball from 2 feet off the ground, 4 feet off the ground, and 6 feet off the ground.
2 feet, 4 feet, 6 feet