qa defs

• 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

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

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

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

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

the diff between a sample statistic and its corresponding population parameter

a probability distribution of all possible sample meant of a given size

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

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

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