whats random sampling
every member has an equal chance of being picked
whats systematic sampling
random start place then a system for picking evert nth member term from then on
whats strafified sampling
a proportional representation of each group within the population
whats cluster sampling
every member of a randomly selected group within the population
what is convenience sampling
a fixed number at the location you are situated or at the start of the area
what is quota
a fixed number of each category with the population