Experimental Design

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

Students wanted to see if the type of material effected the temperature after being placed under a heat lamp for 10 minutes.  
What is the dependent variable for this investigation? 

• Type of material (rocks, sand etc)
• Temperature after 10 minutes
• Time under the lamp
• Heat lamp, amount of material

Which testable questions could be tested using the materials in the picture and necessary measurement tools?

• How does the moon effect the tides?
• How many days does it take the earth to rotate?
• How does the amount of direct sunlight affect temperature?
• How does rotation of the earth effect temperature?

What do you call the things you MUST keep the same to make sure your results are reliable and fair? 

• Constants
• Variables
• Data
• All of the above

Students wanted to see if the distance you pulled back the bow string would effect the distance the arrow travels.  Which tool should students use to measure their dependent variable? 

• Meterstick
• Force sensor 
• Stop watch
• Ruler

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

What type of graph would you make if you were testing oven temperature on the color of cookie?

• Line
• Bar
• Both types are great
• You can't make a graph with data from this experiment

1. Place 20 spinach leaves into the container
2. Put the carbon dioxide sensor in and close       the container 
3. Turn on the light and wait 20 minutes 
4. Check the carbon dioxide levels 
5. Repeat experiment with different amounts of time under the light 
What is the DV?

• Amount of Light
• Amount of Spinach
• Distance from the light 
• Amount of Carbon Dioxide

Which testable question is the student trying to answer?

• Does the amount of tape used effect the number of laughs?
• Does the amount of tape effect the number of minutes of the detention?
• If I waste tape, my teacher is mad 
• All of the above are correct