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A study was done to find if different tire treads affect the braking distance of a car. What is the independent variable?
Tire tread
Car
Braking distance
The height of bean plants depends on the amount of water they receive. What is the independent variable?
Salt or fresh water
Height of plants
Condition of soil
Amount of water
The higher the temperature of the air in the oven, the faster a cake will bake. What is the independent variable?
Time to bake a cake
Temperature of the oven
Type of cake
Place in the oven
Students measured the temperature of the water at different depths in Lake Skywalker and found that the temperature varied. What is the independent variable?
Depth of the measurement
Lake location
Temperature of the water
Measuring device
Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After 3 weeks on the diet, the rats’ masses are measured again to see if there has been a
Rats' masses
Food they received
Amount of Vitamin A
Type of vitamin
Lemon trees receiving the most water produced the most lemons. What is the dependent variable?
Amount of water
Amount of lemons
Type of citrus
Salt or fresh water
An investigation found that more bushels of potatoes were produced when the soil was fertilized more. What is the dependent variable?
Bushels of potatoes produced
Who fertilized the potatoes
Where they were growing
Type of fertilizer
The time it takes to run a kilometre in a sweet ParkRun depends on the person’s running speed. What is the dependent variable?
Person's running speed
Type of race
Location of ParkRun
Time to run a KM
Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured. The independent and dependent variables are?
IV: Age of the students DV: puzzle assembly time
Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculators.
IV: use of calculator; DV: speed of completion
A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper clip was added, the plane was tested to determine how far it would fly.
IV: mass of plane; DV: distance plane flew
One tank of gold fish is fed the normal amount of food once a day. A second tank is fed twice a day. A third tank is fed four times a day during a six week study. The fish’s weight is recorded daily. What is the control?
Size of the tank
The weight of the fish at the end
Amount of food
Mr. S set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.
Distance traveled by the ball
Mass of the ball
Height of the ramp
Mr. B set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. What is the dependent variable?
Mass of the ball
Distance traveled by the ball
Height of the ramp
Mr. B set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. What is the controlled variable?
Distance traveled by the ball
Height of the ramp
Mass of the ball
The librarians want to know which students are checking out what types of books. They are testing "Which type of book do 7th graders check out most often: fiction or nonfiction?" The genre of the book is
the independent variable
the dependent variable
a constant variable
