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# probability distribution.docx

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School
Department
Statistics
Course
STATS 2B03
Professor
Aaron Childs
Semester
Fall

Description
September 21 , 2012 Stats 2B03: Statistical Methods for Science Probability Distribution 3.2-3.4 Some basic probability concepts - Example: a) they are right handed given that both parents are right handed P(R|RR)= =0.8192 P(A|B)= or = =  P(A|B) numerator  P(B) denominator b) P(R|RL or LR) =0.75 c) P(RR|R)= =0.871 d) P(RR|L)= =0.712  The data suggests that if both parents are right handed then the children have a higher chance of being right handed 4.2 Probability distributions for discrete random variables - Random variable (rv): X is a quantity whose values arise as a result of chance factors  E.g.: X=#of boys in a family of 3 children, X=adult height, anything that you can’t predict in advance - a r.v. is discrete if we can list all of its possible values  E.g.: X=#of boys in a family of 3 children (0,1,2,3), cannot
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