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