Essay 1. Many law enforcement agencies use voice-stress analysis to help detemine whether persons under interrogation are lying. Ifthe sound frequency of a person's voice changes when asked a question, the presumption is that the person is being untruthful. For this situation, state the mull and altemative hypotheses in verbal tems, then identify what would constitute a Type I eror and a Type II error in this situation. 2. Following a major earthquake, the city engineer must detemine whether the stadium is structurally sound for an upcoming athletic event. If the null hypothesis is "the stadium is structurally sound" and the altemative hypothesis is "the stadium is not structurally sound," which type of eror (Type I or Type II) would the engineer leastlike to commit?

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