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Science Skills:
Variables
  • Self Check
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A variable is something that can vary or change.  What are the variables in this statement?
  • The time it takes to run a 10 km race depends on the amount of training the runner does.
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The time it takes to run a 10 km race depends on the amount of training the runner does.
  • The independent variable is the amount of exercise.


  • The dependent variable is the time it takes to run a
  • 10 km race.


  • It is not enough to say just “time” or “training” – you must describe the I.V. and tell how the D.V. is measured.
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What are the variables in this statement?
  • The temperature of water is measured at different depths in a lake.
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The temperature of water is measured at different depths in a lake.
  • The independent variable is the depth of the lake.


  • The dependent variable is the temperature of the water.
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What are the variables in this statement?
  • The more water a plant gets,
  • the taller it will grow.
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The more water a plant gets, the taller it will grow.
  • The independent variable is the amount of water.


  • The dependent variable is the height of the grass.
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What are the variables in this statement?
  • The number of puppies in a litter is determined by the weight of the mother dog.
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The number of puppies in a litter is determined by the weight of the mother dog.
  • The independent variable is the weight of the mother dog.


  • The dependent variable is the number of puppies in the litter.
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What are the variables in this statement?
  • The Texas A & M Extension Service has been counting the number of coyotes in Bexar County.  Will the number of coyotes have any effect on the rabbit population?
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The Texas A & M Extension Service has been counting the number of coyotes in Bexar County.  Will the number of coyotes have any effect on the rabbit population?
  • The independent variable is the number of coyotes.


  • The dependent variable is the rabbit population.