Does fertilizer make a plant grow taller? Possible variables? Independent variable? Dependent variable? Sample 1.
Does driving a car faster affect gas mileage? Possible variables? Independent variable? Dependent variable? Sample 2.
Covering a scrap with a band aid decreases healing time? Possible variables? Independent variable? Dependent variable? Sample 3.
Does amount of sleep affect athlete’s speed? Possible variables? Independent variable? Dependent variable? Sample 4.
Does adding salt to water affect how long it takes to boil? Possible variables? Independent variable? Dependent variable? Sample 5.