A graduate student injects 8 rats with a chemical compound commonly found in the environment and finds that all of the rats die within a few days.

A graduate student injects 8 rats with a chemical compound commonly found in the environment and finds that all of the rats die within a few days. Eager to publish her results, the student comes to you, her adviser. What would you suggest the student do before publishing his results? Help him design a controlled experiment. State a good hypothesis, describe the experiment, identify the control group,, independent, dependent and controlled variables.