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Sampling Method. Jn Exercises 9-12, determine whether the sampling method appears to be sound or is flawed. 9. Nuclear Power Plants In a survey of 1368 subjects, the following question was posted on the USA Today website: \"In your view, are nuclear plants safe?\" The survey subjects were Internet users who chose to respond to the question posted on the electronic edition of USA Today. 10. Clinical Trials Researchers at Yale University conduct a wide variety of clinical trials by using subjects who volunteer after reading advertisements soliciting paid volunteers. 11. NHANES Examinations In a recent year, the National Health and Nutrition Examina- tion Survey (NHANES), sponsored by the National Center for Health Statistics, selected more than 9000 subjects who were given physical exams. Subjects were selected through a somewhat complicated procedure designed to obtain results that are representative of the population. 12. Health In a survey of 3014 randomly selected U.S. adults, 45% reported that they have at least one chronic health condition, such as diabetes or high blood pressure. The survey was conducted by Princeton Survey Research Associates International