STAT231 Lecture : chapter4c_CI_proportion.pdf

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Outline: sampling distribution of a proportion (large sample, confidence interval for a proportion, example: compliance of california pharmacies, margin of error. The sampling distribution of a proportion: a bernoulli trial: ix. 1: a proportion is a average of n independent i n p. The sampling distribution of a proportion: the proportion is an average, central limit theorem: the sampling distribution of averages is gaussian when n is large p g. Sampling distribution of a proportion: n is considered large when 3 conditions are met: n n n (1. ) 5: want to see at least fives 1"s and 5 zero"s. The sampling distribution of a proportion: for a bernoulli trial, for n independent bernoulli trials: Var x i nvar x i n (1: for the proportion: The sampling distribution of a proportion: the distribution can be written as p g (1 n. Example: the scale is between 0 and 1.

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