science

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

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asked by lydia
  1. I know it has a control group I just don't know how to explain why

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    posted by lydia
  2. food scraps is the independent variable

    odor (stink/smell) is the dependent variable

    the control is the can without scraps

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    posted by Scott
  3. thank you

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    posted by lydia
  4. why is the can of scraps the control group?

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    posted by matt
  5. without*

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    posted by matt

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