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Example 49

 

Example 49: Find the probability of a person having a positive result on a pregnancy test given that they are not pregnant.   Then find the probability of a person not being pregnant given that they have a positive pregnancy test.   Are these probabilities the same?

Pregnancy Test Results

 

Positive result

Negative Result

 

(Preg. Indicated)

(Preg. Not Indicated)

Totals

Subject is pregnant

80

5

85

Subject is not Pregnant

3

11

14

Totals

83

16

99

 

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