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Topic: [ap-stat] Re: Independent vs Mutually Exclusive
Replies: 2   Last Post: Oct 30, 2004 9:49 AM

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 Pat ballew Posts: 455 Registered: 12/3/04
[ap-stat] Re: Independent vs Mutually Exclusive
Posted: Oct 29, 2004 2:10 AM

"If P(A)&gt;0 and P(B)&gt;0, then, yes, independence implies mutual exclusion."

I don't think that could be what you meant to say, or else I am very
confused. (always a possible explanation)

Pat Ballew
Lakenheath, UK

MathWords <a href="http://www.pballew.net/etyindex.html">http://www.pballew.net/etyindex.html</a>

-----Original Message-----
From: Dave [<a href="mailto://swanson_d@bls.gov]">mailto://swanson_d@bls.gov]</a>
Sent: Thursday, October 28, 2004 6:32 PM
To: for Teachers of AP Statistics
Subject: [ap-stat] Re: Independent vs Mutually Exclusive

The equation P(A or B) = P(A) + P(B) - P(A and B) is always true.
When A&amp;B are mutually exclusive P(A and B) = 0, and when they are
independent P(A and B) = P(A)*P(B).

If P(A)&gt;0 and P(B)&gt;0, then, yes, independence implies mutual exclusion.

On Thu, 28 Oct 2004 07:52:50 -0700, D. Mark Frankum wrote:
&gt;Am I to assume that if 2 events are independent that they canNOT be
&gt;mutually exclusive?
&gt;
&gt;A YMS question stated:
&gt;If P(A) = .24, P(B) = .52 and A and B are independent then find P(A
or B).
&gt;
&gt;P(A or B) = P(A) + P(B) - P(A and B) which is only used when events
are not mutually exclusive.

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