
Product No.
HiMAP PullOut 
Supplementary Print 
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Imperfect Testing
Marsha Davis, Pat Taylor

Mathematics Topic: Algebra, Probability, Statistics 
Application Areas: Various 
Prerequisites: Basic probability 

 ©2001 Consortium 79  8 pages 

The activities in this PullOut deal
with conditional probability.
Activity
1 introduces conditional probability
and provides students with some practice
organizing information into twoway
tables and tree diagrams.
Activity 2
focuses on the imperfect nature of certain
tests, such as testing for drug usage or
particular diseases. Your students will be
surprised to learn that under certain circumstances
the probability of having a
particular trait, given that you have tested
positive for that trait, can be small.



