Down with Earth's Little Wormy

Michelle Guevara, Katie Daniels, Aimee McCulley, & Jacy Vest


I wonder if we evenly distributed the 8 earthworms into three petri dishes, placing eight worms in the middle dish, then have two other dishes connected, one with the natural dirt of the earthworms, and the other with red dirt, if they would evenly distribute between the dirt and natural dirt

Manipulated Variable:

The red moist dirt would be our manipulated variable because we changed the originality of the red dirt by adding water, and making it more suitable for the earthworms to want to live in.


If we have three petri dishes, one with no dirt, one with red dirt, and one with the worms natural dirt, and have the put the worms in the dish without dirt and see if they spread to their natural habitat.


1. Three Petri Dishes

2. Fifteen Earthworms

3. Red Dirt and Caliche Dirt

4. A timer

5. Tape

6. Water

7. Dropper

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Manipulated Variable Procedure:

Like stated before, our manipulated variable is our red moist dirt. We are going to collect our red dirt from a local neighborhood, acquire some water, and then plop about ten drops of water, which creates our moist dirt.

If the drops of water increase it would make our sample of the red dirt, too moist and mud-like for the earthworms to be observed in.

Control Procedure:

Three petri dishes connected by tape each with a different substance inside, one that is empty, one with red dirt, and one with the dirt the worms are used to. We will keep these in a controlled environment and use them towards the hypothesis.


We tested eight worms in our control environment for a five minute time period. We stopped every thirty seconds to observe if the worms had moved to any of the other two petri dishes; the worms had not moved. When we tested our manipulated environment, we noticed that after one minute and a half, one of the worms had finally made it to our moist dirt petri dish. No worm touched the dry dirt, and in the end we had three earthworms in our moist dirt.
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(0-4)^2/4+(3-4)^2/4 = 4.25

We fail to reject our null hypothesis.


In conclusion, we failed to reject our null hypothesis due to the fact that most of the worms did migrate to the moist sand rather than the dry sand.