Identifying Variables

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Identifying Variables
Identify the variables in the following sentences.
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1. The time it takes to run a kilometer depends
on the amount of daily exercise a person gets.
Amount of time (DV)
Amount of daily exercise
3
2. The higher the temperature of the water, the
faster the egg will cook.
Temperature of water
Time needed to cook egg
4
3. An investigation was conducted to see if
keeping the lights on for different amounts of
time each day affected the number of eggs
chickens laid.
Amount of light (number of hours)
Number of eggs
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What variable was manipulated in this
investigation?
4. The amount of pollution produced by cars was
measured for cars using gasoline containing
different amounts of additive.
The amount of additive in gasoline
6
What is the independent variable in this
statement?
5. Lemon trees receiving the most water produces
the largest lemons
Amount of water
7
Identify the independent variable in this
statement.
6. The amount of algae growth in lakes seems to
be directly related to the number of bags of
phosphate fertilizer sold by the local merchants.
The amount of phosphate fertilizer sold
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Identify the independent variable in this
statement.
8. An investigation was performed to see if corn
seeds would sprout at different times depending
on the room temperature of the water in which
they were placed.
Temperature of water
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For each of the following statements identify the
independent variable IV and the dependent
variable DV
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1. Students in science class conducted an
investigation in which a flashlight was pointed
at a screen. They wished to find out if the
distance from the light to the screen had any
effect on the diameter of the illuminated area
IV Distance from light to screen
DV Diameter of illuminated area
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2. The number of pigs in a litter is determined
by the mass of the mother pig
IV Mass of mother pig
DV Number of pigs in the litter
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3. The State Agriculture Department has been
counting the number of foxes in Brown County.
Will the number of foxes have any effect on the
rabbit population?
IV Number of Foxes
DV Number of rabbits
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4.The score on the final test depends on the
number of subordinate skills attained.
IV Skills attained
DV final test
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5. A study was done with white rats to see if the
number of offspring born dead was affected by the
number of minutes of exposure to X-rays by the
mother rats.
IV minutes of x-ray exposure
DV number of offspring born dead