census
attempt to every individual in the whole pop
voluntary response
poeple who choose themselves to be part of the group of interest by responding to general appeal
convinience sample
choose the individuals easiest to reach
simple random sample (SRS)
every inidividual in the population has an ewually likely chance to be chosen
stratified random sample
divide the population into groups of similar indivduals, called strata and then choose a SRS of each group and combine
cluster sample
selecting locartions at random and then sampling everyone in that location
multi stage cluster sample
selecting locartions at random and then selecting portions of that location, and then sample everyone in that location
multi stage sample
take a random sample at multiple levels to reach your final sample
all stages involve random sampling
states- counties- cities- neighborhoods
systematic random
sample has a random starting place and then follows a pattern