Concept explainers
For Exercises 1–7, use the data in the following table that shows results from polygraph (lie detector) experiments conducted by researchers Charles R. Honts (Boise State University) and Gordon H. Barland (Department of Defense Polygraph Institute). In each case, it was known if the subject lied or did not lie, so the table indicates when the polygraph test was correct.
1. If one of the subjects is randomly selected, find the
Compute the probability of selecting a person who lied.
Answer to Problem 1CRE
The probability of selecting a person who lied is 0.520.
Explanation of Solution
Calculation:
The given information is a table which provide the idea about number of person lied or not and corresponding results in the polygraph.
The probability of an event is the chance of occurrence of that event. The probability of an event A is denoted by
Event A denotes the event that the selected person lied.
Substitute 51 for “number of ways event A occurs” and 98 for “Total number of outcomes” in the probability formula.
Therefore,
The probability of selecting a person who lied is 0.520.
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Chapter 6 Solutions
Statistical Reasoning for Everyday Life (5th Edition)
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