Transcript ppt

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 California Department of Fish and Game
has been counting the number of coyotes in
Sierra County. Will the number of coyotes
have any effect on the rabbit population?
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The California Department of Fish and
Game has been counting the number of
coyotes in Sierra 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.