1. Variables Notes

2. Every experiment has 3 types of variables
A student wanted to see if warmer vinegar would make a better baking soda volcano. He used 1 cup of baking soda and 2 cups of vinegar. He put them in 500 mL pop bottle to see how high it would erupt.
Something you manipulate or change on purpose
-temperature of vinegar
2. Something that is affected
-how high it erupted
3. Many things you keep the same
-amount of baking soda, vinegar, bottle

3. Types of Variables
Independent variable—What the experimenter manipulated or changed on purpose
-there should be only one
Ex: How does the amount of yeast affect how bread rises?
Independent variable = amount of yeast

4. Types of Variables
2. Dependent—Factor that is affected and is measured as your result.
-you can have more than one
Ex: How does the amount of yeast affect how bread rises?
Dependent variables = size of dough, speed it rises
density of dough

5. Types of Variables
3. Controlled—Things you keep the same in your experiment
-there should be MANY!
Ex: How does the amount of yeast affect how bread rises?
Controlled variables = type of bread,
type of yeast,
temperature, etc.

6. How to Remember Dependent Responds Y-axis (of graph) Manipulated
Independent
X-axis (of graph)

7. Variables are Everywhere!
Hypotheis:
If __independent variable ____ then, __dependent variable ___, will ______.
Claim:
Describes the relationship between the independent and dependent variables (if there is one).

8. Practice
A student wants to see if the length a catapult’s arm affects how far it throws an object.
Independent variable = length of arm
Dependent = distance object goes
Controlled = catapult design, object,
environmental conditions

9. Template copyright 2005 www.brainybetty.com
Variables
What is a variable?
What types are there?
How do you control variables and why?
How many of each variable should there be?
5. In which processes can you find the variables?
1/13/2019
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