Asked by lydia

Observation
The trash smells.
Explanation
Decaying biological material causes the trash to smell.
Test (independent variable)
Add food scraps to one trash can along with other materials, such as plastic, cardboard, paper, and tin. To a second trash can, add only non-food materials, such as plastic, cardboard, paper, and tin. Observe the smell of each trash can over a few days.
Prediction (dependent variable)
The trash can with food scraps added to it will smell more than the trash can with non-food materials.
Hypothesis
If decaying matter causes the trash to smell, then removing food scraps from the trash will decrease the odor that it produces.  

Is there a control group and why?

please help
Answered by lydia
I know it has a control group I just don't know how to explain why
Answered by Scott
food scraps is the independent variable

odor (stink/smell) is the dependent variable

the control is the can without scraps
Answered by lydia
thank you
Answered by matt
why is the can of scraps the control group?
Answered by matt
without*
Answered by Anonymous
the trash without the food is the control because nothing is being done to it. you are testing to see if the food makes the trash smell.
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