Experimental Design

What is a factor that is measured for change in an experiment?

• control
• constant
• explanatory variable

• response variable

What is the factor that an experimenter changes on purpose?

• Dependent Variable
• Independent Variable
• Constant
• Control

What are all the things that are kept the same in an experiment?

• controls
• data
• constants
• independent variables

What is the affect of salt water on the the height of blades of grass?

What is the independent variable in the above question?

• salt water

• height

• average

• affect

Students used various temperatures of water to see which one dissolved candy faster. 
What was the Independent Variable?

• Amount of Candy
• Amount of Water
• Temperature of Water
• Time for Candy to Dissolve

If plants receive more water, the number of leaves will increase. 
This is an example of 

• Testable Question
• Hypothesis
• Variables
• None of the above

Does the size of deer effect the size of its heart?
What is the IV?

• Size of Deer
• Gender of Deer
• Size of its heart
• Age of deer, gender, and height

In this graph, what is the dependent variable? 

• Walla Walla Island
• Time
• Number of Deer

In this graph, what is the independent variable? 

• Population
• Day
• Species 5

How many variables should you change in an experiment?

• none
• 1
• 2 or more
• depends on the type of experiment