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