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# lec2print - Discrete probability Introduction to discrete...

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Unformatted text preview: Discrete probability Introduction to discrete probability Sayan Mukherjee Sta. 113 Chapter 2 of Devore August 30, 2007 Sayan Mukherjee Introduction to discrete probability Discrete probability Table of contents 1 Discrete probability Set theory Axioms Properties Combinatorics – counting Conditional probability Independence Sayan Mukherjee Introduction to discrete probability Discrete probability Set theory Axioms Properties Combinatorics – counting Conditional probability Independence Probability Two types 1 Discrete – male or female, heads or tails, number of radioactive particles, how many buses go by, counts of nucleotides 2 Continuous – height of people, size of the head of a crab, length of time between volcanic eruptions, images (?), speech signals Sayan Mukherjee Introduction to discrete probability Discrete probability Set theory Axioms Properties Combinatorics – counting Conditional probability Independence Discrete probability – counting Who are the best counters in the world ? Sayan Mukherjee Introduction to discrete probability Discrete probability Set theory Axioms Properties Combinatorics – counting Conditional probability Independence Mathematics of counting and Kevin Bacon Combinatorics – http://en.wikipedia.org/wiki/Combinatorics. What does Paul Erd¨ os have to do with Kevin Bacon ? Sayan Mukherjee Introduction to discrete probability Discrete probability Set theory Axioms Properties Combinatorics – counting Conditional probability Independence Sample space Definition A sample space S is the set of all possible outcomes of an experiment. Examples: 1 Experiment is flipping one coin – Sample space is { H , T } . 2 Experiment is flipping two coins – Sample space is { HH , TT , HT , TH } . 3 Experiment is flipping n coins – How many elements in the sample space ? Sayan Mukherjee Introduction to discrete probability Discrete probability Set theory Axioms Properties Combinatorics – counting Conditional probability Independence Sample space Definition A sample space S is the set of all possible outcomes of an experiment. Examples: 5 Experiment is playing five rounds of Russian roulette – Sample space is { D , LD , LLD , LLLD , LLLD } . Why is this different than coin flipping. 6 6 Experiment is sequencing three nucleotides – Sample space is { AAA , CCC , GGG , TTT , AAC , AAT , AAG , ..., } . How big is this sample space ? Hint there are four nucleotides { A , C , T , G } so 4 3 . Sayan Mukherjee Introduction to discrete probability Discrete probability Set theory Axioms Properties Combinatorics – counting Conditional probability Independence An event Definition A event is any collection of outcomes contained in the sample space, S ....
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## This note was uploaded on 03/29/2009 for the course STAT 113 taught by Professor Mukherjee during the Fall '08 term at Duke.

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lec2print - Discrete probability Introduction to discrete...

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