For each experimental question, identify the independent variable (IV), dependent variable (DV), constants and the control.
For Each, Ask Yourself:
What am I changing on purpose so that I can answer my question? -- this is your Independent Variable.
What is being 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 your zero IV level? What is your normal group that does not recieve any testing.---This is your Control
Does the brand of allergy medication affect the number of times a person sneezes?
No allergy medicine
The brand of medicine
The person taking the medicine
The time of day medicine is taken
The amount of allery medicine
The number of sneezes
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
amount of sunlight
amount of water
No soil
Amount of soil
Height of plant (in cm)
Independant Variable
Dependent Variable
Constants (3)
Control
Which type of sunscreen prevents burns for the longest amount of time?
amount of sunscreen used
Time to burn (minutes)
Brand of sunscreen
Time of day
skin tone of persons being tested
No sunscreen
Independant Variable
Dependent Variable
Constants (3)
Control
What paper towel brand absorbs the most water?
Size of paper towel
Temperature of water
Amount of water absorbed (mL)
Surface water is spilled on
None (need a paper towel to absorb any water)
Brand 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.
Temperature stove burner is set on.
None (can't cook eggs without a pan)
Material pan is made out of.
Size of eggs
Minutes until egg is cooked
Size of pans
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)
French fries are on the same table
Number of french fries
None (can't test without french fries)
Fries from different restraurants
Handle french fries with gloved hands
Independant Variable
Dependent Variable
Constants (3)
Control
Which brand of dish soap makes the most amount of suds?
None (need suds to make bubbles)
Amount of dish soap
Amount of water
Brand of dish soap.
Time water and soap is stirred
Volume of suds (mL)
Independant Variable
Dependent Variable
Constants (3)
Control
What type of physical activity gives you the highest heart rate?
Time spent on activity
Heart rate (beats per minute)
Sitting (no activity)
Type of physical activity
Person doing the activity
Outside temperature
Independant Variable
Dependent Variable
Constants (3)
Control
What type of detergent gets out grass stains the best?
Brand of detergent
Same wash cycle
washed in water without detergent
Size of original stain
Area of stain removed (cm^2)
Type of original stain
Independant Variable
Dependent Variable
Constants (3)
Control