2.   Does fertilizer make a plant grow taller?  Possible variables?  Independent variable?  Dependent variable? Sample 1.

3.   Does driving a car faster affect gas mileage?  Possible variables?  Independent variable?  Dependent variable? Sample 2.

4.   Covering a scrap with a band aid decreases healing time?  Possible variables?  Independent variable?  Dependent variable? Sample 3.

5.   Does amount of sleep affect athlete’s speed?  Possible variables?  Independent variable?  Dependent variable? Sample 4.

6.   Does adding salt to water affect how long it takes to boil?  Possible variables?  Independent variable?  Dependent variable? Sample 5.