In Exercises 6-7, use the pregnancy test data given in the following table. Tabl
ID: 3216643 • Letter: I
Question
In Exercises 6-7, use the pregnancy test data given in the following table.
Table 1 Pregnancy Test Results
Positive Test Results
Negative Test Results
Subject is pregnant
160 (True Positive)
10 (False Negative)
Subject is Not pregnant
6 (False Positive)
22 ( True Negative)
6-Pregnancy Test – If one of the test subjects is randomly selected, find the probability that the subject had a positive test result or a negative test result.
7-Pregnancy Test – If one of the subjects is randomly selected, find the probability that the subject had a negative test result or does not pregnant.
8-Pregnancy Test – If one of the subjects is randomly selected, find the probability that the subject had a false negative test result or a false positive test result.
In Exercises 9-10, find the indicated complements.
9-Find P() given that P(A) = 0.025.
10-A Reuters/Zogby poll showed that 61.3% of Americans say they believe that life exists elsewhere in the galaxy. What is the probability of randomly selecting someone not having that belief?
Table 1 Pregnancy Test Results
Positive Test Results
Negative Test Results
Subject is pregnant
160 (True Positive)
10 (False Negative)
Subject is Not pregnant
6 (False Positive)
22 ( True Negative)
Explanation / Answer
Answer to the questions as below:
6. P( +ive or -ive result) = 1
7. P(-ve or not Preg) = (6+22+10) / 198 = .192
8. P( false -ive or false +ive ) = 16/198 = .081
9. P(A') = 1-P(A) = 1-.025 = .975
10.P(no belief) = 1-.613 = .397