10/25/2010
Human Problem Solving
Lecture Study Questions #4
L.59. In a large population, one person out of one thousand has a certain disease, X.
There is a test for the disease, and if a person has X, then the test is positive.
Unfortunately, if a person does not have X, then the test yields a positive result 5% of the
time anyway.
Suppose a person tests positive which of the following numbers is closest
to his or her probability of having X?
(1.0, .95, .75, .40, .02).
Harvard Medical students
tended to pick which of these probabilities as their answer?
What aspect of Bayes’
theorem did they seem to neglect?
L.60. In the case of syllogistic reasoning I explained that for the conclusion to follow
from the premises it must be the case that it follows from every possible representation of
the premises. Given this, why is it incorrect to conclude that ‘Some C are A’ from the
premises ‘Some A are B’ and ‘Some B or C.’
L.61. Gregory Bateson had a theory that people are at risk of schizophrenic cognition
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 Fall '10
 WilliamH.BATCHELDER
 Logic, Gregory Bateson, lecture study questions, Human Problem Solving, games master, socalled ‘double binds

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