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AP Statistics
Chapter 8
Section 1
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View Full Document A gaggle of girls
•
The Ferrell family have 3 children: Jennifer,
Jessica, and Jaclyn.
•
If we assume that a couple is equally likely to
have a girl or a boy, then how unusual is it for a
family to have 3 children who are all girls?
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If success = girl (of course) and failure = boy
(sorry), then p(success) = .5
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Define random variable X as the number of girls
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Simulate families with 3 children to determine
the longterm relative frequency of a family with
3 girls, P(X=3)
1. Let even digits represent girls: 0,2,4,6,8
Let odd digits represent boys: 1,3,5,7,9
1. RandInt (0,9,3)
If all three digits are even it represents a family with three girls.
Any other combination of digits represents a family with a mixture of
genders or all boys.
Perform 40 simulations. Combine with classmates.
Calculate the relative frequency of the event {3 girls}.
3 girls
Not 3 girls
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View Full Document X
P(X)
Determine the sample space for this simulation.
What are the possible outcomes?
X = number of girls
bbg
bgg
bgb
gbg
bbb
gbb
ggb
ggg
0 girls
1 girl
2 girls
3 girls
Vocab
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Binomial Setting
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Binomial random variable
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Binomial distribution – B(n,p)
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This note was uploaded on 04/10/2011 for the course MATH 1070 taught by Professor Akbas during the Fall '08 term at Georgia State University, Atlanta.
 Fall '08
 AKBAS
 Statistics, AP Statistics

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