10.6) Many law enforcement agencies use voice-stress analysis to help determine whether persons under interogation are lying. If the sound of frequency of a persons voice changes when asked a question, the presumption is that the person is being untruthful. For this situation, state the null and alternative hypothesis in verbal terms, then identify what would constitute a Type I error and a Type II error in this situation.
Any assistance would be greatly appreciated.
10.6: Many law enforcement agencies use voice-stress analysis to help determine whether persons under interrogation are lying. If the 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 null and alternative hypothesis in verbal terms, then identify what would constitute a Type I error and a Type II error in this situation.
Answer:
Ho: The sound of a person’s voice changes when asked a question is not evidence that they are being untruthful
H1: The sound of a person’s voice changes when asked a question is evidence they are being untruthful
Type I occurs when you reject a null hypothesis that was true.
Type II occurs when you accept a null hypothesis that was false.
The null hypothesis is the basic statement that is true or false for the case.
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