Homework Answers
a) Type I error is same as false positive which means even if a person is speaking the truth, it'll detect as lie.
So probability of type I error = 0.1
b) Type II error is same as false negative which means even if the person is telling lie, it'll detect as truth.
So probability of type II error = 1-0.89 = 0.11
Hence probability of type II error = 0.11
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A polygraph (lie detector) is an instrument used to determine if an individual is telling the...
A polygraph (lie detector) is an instrument used to determine if the individual is telling the...
A polygraph (lie detector) is an instrument used to determine if the individual is telling the truth. These tests are considered to be 93% reliable. In other words, if an individual lies, there is a 0.930 probability that the test will detect a lie. Let there also be a 0.003 probability that the test erroneously detects a lie even when the individual is actually telling the truth. Consider the null hypothesis, "the individual is telling the truth," to answer the...
A polygraph (lie detector) is an instrument used to determine if an individual is telling the...
A polygraph (lie detector) is an instrument used to determine if an individual is telling the truth. These tests are considered to be 88% reliable. In other words, if an individual lies, there is a 0.88 probability that the test will detect a lie. Let there also be a 0.035 probability that the test erroneously detects a lie even when the individual is actually telling the truth. Consider the null hypothesis, "the individual is telling the truth," to answer the...
A polygraph (lie detector) is an instrument used to determine if an individual is telling the...
A polygraph (lie detector) is an instrument used to determine if an individual is telling the truth. These tests are considered to be 96% reliable. In other words, if an individual lies, there is a 0.96 probability that the test will detect a lie. Let there also be a 0.008 probability that the test erroneously detects a lie even when the individual is actually telling the truth. Consider the null hypothesis, "the individual is telling the truth," to answer the...
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The table below includes results from polygraph (lie detector) experiments conducted by researchers. In each case, it was known if the subjected lied or did not lie, so the table indicates when the polygraph test was correct. Use a 0.05 significance level to test the claim that whether a subject lies is independent of the polygraph test indication. Do the results suggest that polygraphs are effective in distinguishing between truth and lies? Click the icon to view the table. Determine...
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The table below includes results from polygraph (lie detector) experiments conducted by researchers. In each case,...
The table below includes results from polygraph (lie detector) experiments conducted by researchers. In each case, it was known if the subjected lied or did not lie, so the table indicates when the polygraph test was correct. Use a 0.05 significance level to test the claim that whether a subject lies is independent of the polygraph test indication. Do the results suggest that polygraphs are effective in distinguishing between truth and lies? Did the Subject Actually Lie? No (Did Not...
A polygraph (lie detector) is an instrument used to determine if an individual is telling the truth. These tests are considered to be 92% reliable. In other words, if an individual lies, there is a 0.92 probability that the test will detect a lie. Let there also be a 0.080 probability that the test erroneously detects a lie even when the individual is actually telling the truth. Consider the null hypothesis, "the individual is telling the truth," to answer the...
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