What the great white sharks represent to mankind, Orcinus orca, better known as the super-shiny killer whale, is to great white sharks a hundredfold. It's not necessarily true that killer whales hunt great whites for food -- scientists actually aren't sure what the relationship is between the two species. What we know is that the whales are smart enough to have figured out that sharks need to move in order to breathe, so they hold the sharks upside down until they are immobilized, slowly suffocating, until they're dead.
The independent variable DRUG would be an active independent variable. An attribute independent variable occurs when groups are compared, but the grouping variable cannot be chosen and manipulated by the investigators because it is a characteristic of the subjects themselves.Example 7: One example of an attribute variable is gender.here may be up to 3-5 groups per variable, but usually not more than that. Example 4: If a study is comparing two types of treatments: a placebo and an experimental treatment, the independent variable is treatment and it has two levels: placebo and experimental.
independent variable. noun. 1  Mathematics A variable whose value determines the value of other variables. 2  Statistics A manipulated variable in an experiment or study whose presence or degree determines the change in the dependent variable.