Review for Exam 2 Parameters vs Statistics Probability vs Statistics Proportions Means Chapter 7 Sampling Distributions distribution of values a sample statistic takes in repeated sampling. Sampling distribution of p-hat: X is Binomial (count of successes) n p p p N p ) 1 ( , ( ~ ˆ Normal IF np 15 and n(1-p) 15 Sampling Distribution of x-bar X is a quantitative random variable with mean and standard deviation n N X , ~ Normal IF if n 30 or Original distribution Normal Chapter 8 Confidence Intervals: estimator (z or t) stderror Confidence Intervals in General
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