Practice Identifying Variables Name: _______________________Per.____
Define IV: ________________________________________________________________________________
Define DV: ________________________________________________________________________________
Define “Constants”: _________________________________________________________________________
IV = independent variable DV = dependent variable
Identify the types of variables in each written statement. READ CAREFULLY!
1. A study was done to find if fuel types affect the engine’s performance in a car.
Independent Variable: fuel type
Dependent Variable: engine performance
Constants: car, driver, driving location and speed
2. An experiment was performed to determine the health effects of different amounts of second-hand smoke on
one-year old hamsters.
Independent Variable: _________________________________________________________________
Dependent Variable: __________________________________________________________________
Constants: ___________________________________________________________________________
3. A study was conducted to determine the effect of climbing to high altitudes on a climber’s memory.
Independent Variable: _________________________________________________________________
Dependent Variable: __________________________________________________________________
Constants: ___________________________________________________________________________
4. Students of different ages were given the same math test. Researchers looked at the number of correct
answers on the test.
Independent Variable: _________________________________________________________________
Dependent Variable: __________________________________________________________________
Constants: ___________________________________________________________________________
5. A study was done to see the effect of different cancer drugs on tumor size in male patients.
Independent Variable: _________________________________________________________________
Dependent Variable: __________________________________________________________________
Constants: ___________________________________________________________________________
6. Mad scientists looked at the growth of claw size in mutant lobsters due to drinking different amounts of sea
water contaminated with Pepsi.
Independent Variable: _________________________________________________________________
Dependent Variable: __________________________________________________________________
Constants: ___________________________________________________________________________
7. Global researchers monitored the levels of carbon dioxide in the atmosphere each month of the year.
LT: I can define
independent variable
(IV), dependent variable
(DV), and constant and
identify each in an
experiment. ____
