Proof of safety vs proof of hazard.

This paper refines and extends the work of Bross (1985, Biometrics 41, 785-793). One method to determine whether an environment is safe or hazardous is to frame the problem in the context of hypothesis testing. Any "proof" of safety or hazard will depend on the size of both the Type I and Type II errors associated with the test. Many past environmental monitoring programs, however, have ignored the power of the design, regardless of whether the objective was proof of safety or hazard.