Data Collection And Analysis Q Conclusion

Measure and compare the distance Data supported the from the owl's strike to the mouse and to the leaf in light and dark.

hearing hypothesis: Owls hunt in the dark by hearing.

The independent variable in the owl experiment is the presence or absence of light. In the owl experiment, the control group hunts in the light, and the experimental group hunts in the dark. In addition to varying the independent variable, a scientist observes or measures another factor called the dependent variable, or responding variable, because it is affected by the independent variable. In the owl experiment, the dependent variable is distance from the owl's strike to the mouse's head.

Testing the Experiment

Some controlled experiments are conducted "blind." In other words, the biologist who scores the results is unaware of whether a given subject is part of the experimental or control group. This factor helps eliminate experimenter bias. Experiments should also be repeated, because living systems are variable. Moreover, scientists must collect enough data to find meaningful results.

figure 1-10

The data below are hypothetical results that might occur from the described owl experiment. The independent variable is the darkness of the room, and the dependent variable is how far the owl struck from the mouse's head. The data show that the owl strikes more accurately at the mouse in the light but strikes more accurately at the leaf in the dark.

Distance Between Owl Strike and a Mouse or From a Leaf Attached to Mouse

Distance Between Owl Strike and a Mouse or From a Leaf Attached to Mouse

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