AP Stats Unit 5 Flashcards

sampling distribution

the probability distribution of a statistic (like the sample mean or proportion) calculated from all possible random samples of a specific size drawn from a population

calculating probabilities from sampling distributions

what is the probability of obtaining this sample mean among all the possible sample means

layers to sampling distribution

the population distribution, distribution of one sample, distribution of all possible samples from the population

central limit theorem

if the sample size is large enough, the sampling distribution of a statistic of a random variable will be approximately normal

what’s large enough for CLT for means

n >= 30

what’s large enough for CLT for proportions

np >= 30, n(1-p) >= 10

unbiased

if sample statistic is equal to population parameter

what is a sample statistic

a point estimator of the population parameter