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