Stat 13 Lecture 19 discrete random variables, binomial A random variable is discrete if it takes values that have gaps : most often, integers Probability.

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Stat 13 Lecture 19 discrete random variables, binomial A random variable is discrete if it takes values that have gaps : most often, integers Probability function gives P (X=x) for every value that X may take X= number of heads in 3 tosses A couple decides to have children till at least one of each sex or a maximum of 3; X=number of girls. (tree)

Expected value and standard deviation E(X) = sum of P(X=x) x (weighted average; using probability as weight) Var (X) = sum of P(X=x) (x- E(X)) 2

Binomial probability Coin tossing ; multiple choices ; formula of binomial ; combination number P(X=x)= ( ) p x (1-p) (n-x) Sampling with replacement Sampling without replacement; infinite population Sampling without replacement, finite population; (opinion ) survey sampling nxnx

Conditions for binomial to hold Model the number of successful trials out of n trials Must know n Must know (or be able to estimate) p (=prob of success in each trial) Must satisfy independence assumption in different trials p should be the same in each trial

Sampling without replacement Suppose in a population of N individuals, a random sample of n individuals are selected. Their opinions on a proposal are recorded. Suppose in the population the proportion of individuals saying yes is p. Then X, the number of individuals in the sample saying yes follows a hypergeomtric distribution P(X=x)= [Np choose x][N(1-p) choose (n-x)]/ [N choose n], which is approximately equal to binomial when N is large and the sampling fraction n/N is small.