A study of a new weight-loss drug is done with 1,000 laboratory rats. All the rats are given the same diet and kept in identical cages. 500 randomly selected rats are given an injection with the real drug while the other 500 rats are given a placebo injection containing only saline solution. Weight changes are monitored weekly.What is the dependent variable in the experiment? The type of injection given to the rats The age of the rats The saline solution given to the rats The weight change of the rats
The dependent variable is the one direct linked to the experiment. Therefore, the weight changes of the rats in the study is the dependent variable in this example, that's because is the measurable factor for the drug test.
