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