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continuity correction factor
 1. atleast X occurs = x.5
 2. more than X occurs= x+.5
 3. x or fewer occurs= x+.5
 4.fewer than x occurs=x.5

simple random sample
a sample selected so that each item or person in the population has the same chance of being included

systematic random sample
a random starting point is selected, and then every kth member of the population is selected

stratified random sample
a population is divided into subcatagories, called strat, and a sample is randomly selected from each stratum

cluster sample
a population is dvided into clusters using naturally occuring geographic or other boundaries. then clusters are randomly selected and a sample is collected by randomly selecting from each cluster

sampling error
the diff between a sample statistic and its corresponding population parameter

sampling distribution of the sample mean
a probability distribution of all possible sample meant of a given size

central limit theorem
if all samples of a particular size are selected from any population, teh sampling distribution of the sample mean is approximately a normal distribution. this approximation improves with larger samples

point estimate
the statistic, computed from sample information which is used to estimate the population paremeter

confidence interval
a range of values constructed from a sample data so that the population parameter is likely to occur within that range at a specified probability. the specified probability is called the level of convidence

