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lec11 - STATISTICS 13 STATISTICS Lecture 11 Oct 20 2010...

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STATISTICS 13 STATISTICS 13 STATISTICS 13 Lecture 11 Lecture 11 Oct. 20, 2010 Oct. 20, 2010
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Review Regression effect Probability: basic concepts -experiment, simple events
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Basic Concepts: Sample Space The set of all possible simple events of an experiment is called the sample space (usually denoted by S) corresponding to that experiment Example : Experiment : Toss two coins once Sample space : S =
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Basic Concepts: Events An event (usually denoted by E, F, A, B, etc) is a collection of simple events. In another word, a subset of the sample space Any subset of the sample space (including the empty set) is an event Example : Throw a die S = {1,2,3,4,5,6} S S A A B B A : (An odd number) = {1,3,5} B : (A number > 2) = {3,4,5,6} 1 2 3 4 5 6
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Basic Concepts: Mutually Exclusive Two events A and B are mutually exclusive if whenever one of them occurs the other cannot occur Example : Throw a die A: observe an odd number B: observe a number greater than 2 C: observe an even number D: observe a 3
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Probability: Relative Frequency View How often does “an event” occur ?
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lec11 - STATISTICS 13 STATISTICS Lecture 11 Oct 20 2010...

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