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Unformatted text preview: valent to the statement that, as a function of the argument B for A ﬁxed, the conditional probability P (B A) has all the properties of an unconditional
probability measure P. Compare these properties to the probability axioms in Section 1.2. Intuitively, if one assumes a probability distribution P is given, and then later learns that an event A
is true, the conditional probabilities P (B A) as B varies, is a new probability distribution, giving
a new view of the experiment modeled by the probability space. 2.4
2.4.1 Independence and the binomial distribution
Mutually independent events Let A and B be two events for some probability space. Consider ﬁrst the case that P (A) > 0.
As seen in the previous section, it can be that P (B A) = P (B ), which intuitively means that
knowledge that A is true does not aﬀect the probability that B is true. It is then natural to
consider the events to be independent. If P (B A) = P (B ), then knowledge that A is true does
aﬀect the probability that B is true, and it is natural to consider the events to be dependent
(
(i.e. not independent). Since, by deﬁnition, P (B A) = PP AB ) , the conditi...
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This note was uploaded on 02/09/2014 for the course ISYE 2027 taught by Professor Zahrn during the Spring '08 term at Georgia Institute of Technology.
 Spring '08
 Zahrn
 The Land

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