identifying variables
DESCRIPTION
Identifying Variables. A variable is something that can change in a situation. What are the variables in the following statements?. The time it takes to run a kilometer depends on the amount of exercise a person gets. _______________________ _______________________. time to run a kilometer. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Identifying Variables](https://reader036.vdocuments.us/reader036/viewer/2022081504/56813c6b550346895da5fb02/html5/thumbnails/1.jpg)
Identifying Variables
![Page 2: Identifying Variables](https://reader036.vdocuments.us/reader036/viewer/2022081504/56813c6b550346895da5fb02/html5/thumbnails/2.jpg)
A variable is something
that can change in a
situation. What are the
variables in the following
statements?
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The time it takes to run a
kilometer depends on the
amount of exercise a
person gets.
_______________________
_______________________
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The higher the temperature
of water, the faster the egg
will cook.
_______________________
_______________________
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An investigation was done to see if
keeping the lights on for different
amounts of time each day affected
the number of chicken eggs layed.
_______________________________
_______________________________
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Grass will grow taller if it is
watered evenly and is
fertilized.
_______________________
_______________________
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If a variable is deliberately
changed in a situation, it is
called
_______________________
_______________________
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What variable is being
manipulated in the
following situations?
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The amount of pollution
produced by cars was
measured for cars using
gasoline containing
different amounts of lead?
_______________________
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Lemon trees receiving the
most water produced the
largest lemons.
_______________________
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The amount of algae growth
in lakes seems to be directly
related to the number of
sacks of phosphorous
fertilizer sold by local
merchants.
_______________________
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An investigation was
performed to see if corn
seeds would sprout at
different times depending on
the temperature of the water
in which they were placed.
_______________________
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The variable that may
change as a result of the
manipulation is called the
_______________________
_______________________
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Identify the manipulated
(independent) variable &
the responding
(dependent) variable in
the following situations.
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More bushels of potatoes
will be produced if the soil
is fertilized more.
MV (IV) ______________
RV (DV)______________
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5 groups of rats are fed identical diets
except for the amount of Vitamin A that
they receive. Each group gets a different
amount. After 3 weeks on the diet, the rats
are weighed to see if their weight has
changed.
MV (IV) ______________
RV (DV)______________
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An experiment was done with 6 groups of
children to see if scores on their weekly
spelling tests were affected by the number
of minutes of spelling practice that they
had each day.
MV (IV) ______________
RV (DV)______________
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Students in a science class carried out 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 size of the
illuminated area.
MV (IV) ______________
RV (DV)______________
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The State Agriculture Dept. has been
counting the number of foxes in
Brown County. Will the # of foxes
have any effect on the rabbit
population?
MV (IV) ______________
RV (DV)______________
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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.
MV (IV) ______________
RV (DV)______________
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Now! Let’s put the
data from the
variables into a table
and learn how to
graph the data.
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Length of Drop (cm)
Height of Bounce (cm)
10 8
30 24
50 40
70 56
100 80
Usually
the
manipulat
ed
variable
(independ
ent
variable)
is written
on the
left, but
not
always.
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Length of Drop (cm)
Height of Bounce (cm)
10 8
30 24
50 40
70 56
100 80
The
independe
nt variable
is always
graphed
on the
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Length of Drop (cm)
Height of Bounce (cm)
10 8
30 24
50 40
70 56
100 80
How High Will a Ball Bounce Dropped From Various Heights?
0
20
40
60
80
100
10 30 50 70 100
Length of Drop ( cm)
Heig
ht o
f Bou
nce
(cm
)
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DEPENDENT
RESPONDING
AXIS
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MANIPULATED
INDEPENDENT
AXIS