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Getting to Know Your Variables (Again!)
By Amy Hodge
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Last updated almost 6 years ago
9 questions
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Experimental Design--ID IV, DV, Constants and Controls
For each experimental question, identify the independent variable (IV), dependent variable (DV), constants and the control.
For Each, Ask Yourself:
What amÂ
I
changing
on purpose so thatÂ
I
can answer my question? -- this is your
Independent Variable
.
What is beingÂ
measured
? What data (numbers) are being collected? --this is your
Dependent Variable
.
What is
staying the same
in all of the exeriments? -- these are your
Constants
.
What is yourÂ
zero IV level
? What is your normal group that does not recieve any testing.---This is your
Control
Question 1
1.
Question 2
2.
Question 3
3.
Question 4
4.
Question 5
5.
Question 6
6.
Question 7
7.
Question 8
8.
Question 9
9.
Does the brand of allergy medication affect the number of times a person sneezes?
The brand of medicine
The amount of allery medicine
The number of sneezes
No allergy medicine
The person taking the medicine
The time of day medicine is taken
Independant Variable
Dependent Variable
Constants (3)
Control
Does the amount of soil a plant is placed in affect how tall it grows?
amount of water
Height of plant (in cm)
Amount of soil
No soil
amount of sunlight
type of plant
Independant Variable
Dependent Variable
Constants (3)
Control
Which type of sunscreen prevents burns for the longest amount of time?
skin tone of persons being tested
amount of sunscreen used
Time of day
No sunscreen
Time to burn (minutes)
Brand of sunscreen
Independant Variable
Dependent Variable
Constants (3)
Control
What paper towel brand absorbs the most water?
Brand of paper towel.
Size of paper towel
Amount of water absorbed (mL)
Surface water is spilled on
Temperature of water
None (need a paper towel to absorb any water)
Independant Variable
Dependent Variable
Constants (3)
Control
Sam wants to figure out which pan cooks eggs the fastest: bronze, copper or steel.
Temperature stove burner is set on.
Size of eggs
None (can't cook eggs without a pan)
Material pan is made out of.
Size of pans
Minutes until egg is cooked
Independant Variable
Dependent Variable
Constants (3)
Control
Ashton wants to see which fast food restaurant has french fries that will take the longest to grow mold.
Number of french fries
Handle french fries with gloved hands
Time to grow mold (days)
None (can't test without french fries)
Fries from different restraurants
French fries are on the same table
Independant Variable
Dependent Variable
Constants (3)
Control
Which brand of dish soap makes the most amount of suds?
Volume of suds (mL)
None (need suds to make bubbles)
Amount of water
Brand of dish soap.
Amount of dish soap
Time water and soap is stirred
Independant Variable
Dependent Variable
Constants (3)
Control
What type of physical activity gives you the highest heart rate?
Type of physical activity
Time spent on activity
Outside temperature
Sitting (no activity)
Heart rate (beats per minute)
Person doing the activity
Independant Variable
Dependent Variable
Constants (3)
Control
What type of detergent gets out grass stains the best?
Same wash cycle
Size of original stain
washed in water without detergent
Area of stain removed (cm^2)
Type of original stain
Brand of detergent
Independant Variable
Dependent Variable
Constants (3)
Control