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Chapter 1

RS Chapter 1 Random Variables6/14/20191 Chapter 1 probability theory : IntroductionBasic probability General In a probability space ( , , P), the set is the set of all possible outcomesof a probability experiment . Mathematically, is just a set, with elements . It is called the sample space. An eventis the answer to a Yes/No question. Equivalently, an event is a subset of the probability space: A . Think of A as the set of outcomes where the answer is Yes , and Acis the complementary set where the answer is No . A -algebra is a mathematical model of a state of partial knowledge about the outcome. Informally, if is a -algebra and A , we say that A if we know whether A or Chapter 1 Random Variables6/14/20192 Definitions AlgebraDefinitions: Semiring(of sets)A collection of sets Fis called a semiringif it satisfies: F. If A, B F, then A B F.

Probability Theory: Introduction Basic Probability – General an•I probability space (Ω, Σ, P), the set Ωis the set of all possible outcomes of a “probability experiment”. Mathematically, Ω is just a set, with elements ω. It is called the sample space. •An event is the answer to a Yes/No question. Equivalently, an event

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