The independent variable influences and causes a change in the dependent variable. Hunting -independent variable- influences on the species population sizes -dependent variable-.
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Available data:
protected from hunters?
Condor, and Black Swans every ten years.
Before conducting the experiment, researchers need to identify the study groups –experimental and control groups- and the variables involved.
⇒ The study groups are the species Whooping Crane, California Condor, and Black Swans.
⇒ Variables
In the exposed example, the independent variable is hunting. Hunting affects the previously mentioned species, moreover because they already are endangered species. So excessive hunting might cause species extinction. Reduced or controlled hunting might help the population sizes to remain constant. But no hunting at all might be closely related to an increase in their population sizes.
In the exposed example, the species population sizes are the dependent variables. Researchers measure every ten years how many animals of each species remain in the study area. These numbers depend on hunting, and their changes are inversely proportional to the change in hunting. An increase in hunting means a decrease in the species population size. a Decrease in hunting means an increase in the species population sizes.
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