Use the table below to answer the following questions. Positive Test Result (Pre
ID: 2935018 • Letter: U
Question
Use the table below to answer the following questions.
Positive Test Result
(Pregnancy is indicated)
Negative Test Result
(Pregnancy is not indicated)
Subject is Pregnant
8080
66
Subject is Not Pregnant
33
1010
a. If one of the 99 test subjects is randomly selected, what is the probability of getting a subject who is pregnant?
P(Pregnant)equals=StartFraction 86 Over 99 EndFraction8699
(Type an integer or a simplified fraction.)
b. A test subject is randomly selected and is given a pregnancy test. What is the probability of getting a subject who is pregnant, given that the test result is positive?
P(Pregnant|Positive)equals=nothing
(Type an integer or a simplified fraction.)
Positive Test Result
(Pregnancy is indicated)
Negative Test Result
(Pregnancy is not indicated)
Open in StatCrunch + Copy to Clipboard + Open in Excel +Subject is Pregnant
8080
66
Subject is Not Pregnant
33
1010
Explanation / Answer
a) P(Pregnent) = (80 + 6)/99 = 86/99
b) P(Getting a pregnant subject | Test results positive)
= 80/(80 + 3)
= 80/83
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