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Control & Variable Notes. Where do I start?. After you have a question that you want to answer using the scientific method, there are a few important things you need to think about while setting up your experiment. Example Question #1:.

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where do i start
Where do I start?
  • After you have a question that you want to answer using the scientific method, there are a few important things you need to think about while setting up your experiment.
example question 1
Example Question #1:
  • Does heating a cup of water allow it to dissolve sugar faster?
the control
THE CONTROL
  • A control is the part of the experiment that remains the same.
  • It may also be called the constant.
how to remember
How to Remember:
  • WHAT I KEEP THE SAME
back to the example
Back to the Example
  • Question #1: Does heating a cup of water allow it to dissolve sugar faster?
  • Control #1: Type of water, Type of sugar, amount of water…
control group
CONTROL GROUP
  • The control group provides a baseline for comparison.
how to remember1
HOW TO REMEMBER:
  • LEAVE OUT WHAT YOU ARE TESTING
back to the example1
Back to the Example:
  • Question #1: Does heating a cup of water allow it to dissolve sugar faster?
  • Control #1: Type of water, Type of sugar, amount of water…
  • Control Group #1: Room temperature water
what is a variable
What is a Variable?
  • A variable is the part of the experiment that changes. An experiment usually has two kinds of variables: independent and dependent.
independent variable
INDEPENDENT VARIABLE
  • The variable that is changed by the scientist.
  • To insure a fair test, a good experiment has only ONE independent variable. As the scientist changes the independent variable, he or she observes what happens.
how to remember2
HOW TO REMEMBER:
  • WHAT I CHANGE
back to the example2
Back to the Example
  • Question #1: Does heating a cup of water allow it to dissolve sugar faster?
  • Control #1: Type of water, Type of sugar, amount of water…
  • Control Group #1: Room temperature water
  • I.V. #1 : Temperature of the water
dependent variable
DEPENDENT VARIABLE
  • The variable that is caused by the change the scientist made.
  • The scientist focuses his or her observations on the dependent variable to see how it responds to the change made to the independent variable.
how to remember3
HOW TO REMEMBER:
  • WHAT I OBSERVE
back to the example3
Back to the Example
  • Question #1: Does heating a cup of water allow it to dissolve sugar faster?
  • Control #1: Type of water, Type of sugar, amount of water…
  • Control Group #1: Room temperature water
  • I.V. #1 : Temperature of the water
  • D.V. #1: How fast sugar dissolves
example 2
Example #2:
  • Question #2: Does fertilizer make a plant grow bigger?
example 21
Example #2:
  • Control(s):
    • size of plant
    • size of pot
    • amount of soil
    • type of soil
    • amount of water
example 22
Example #2:
  • Control Group:
    • A plant with no fertilizer
example 23
Example #2:
  • Independent Variable (What I Change):
    • Amount of fertilizer
example 24
Example #2:
  • Dependent Variable (What I Observe):
    • Height of plant
example 3
Example #3:
  • Question #3: What type of dish soap best removes spaghetti sauce stains from plates?
example 31
Example #3:
  • Control(s):
    • amount of sauce
    • type of plate
    • amount of dish soap
example 32
Example #3:
  • Control Group:
    • Using just water to wash
example 33
Example #3:
  • Independent Variable (What I Change):
    • type of dish soap
example 34
Example #3:
  • Dependent Variable (What I Observe):
    • Amount of sauce stain leftover.