small part of the target population Sample true Clustered false Systematic Random false Double false Single a sampling that is done by using pre-existing or natural subgroups of a population Sequence false Clustered true Systematic Random false Double false Single a sampling that is done by selecting samples using a designated interval Sequence false Simple Random false Systematic Random true Double false Single a sampling that is done in two phases: initial and next Sequence false Simple Random false Multistage false Double true Single a sampling that takes samples using succesive members of the population in time interval depending on the need of the study Sequence true Simple Random false Multistage false Convenience false Single a sampling that is done by assigning each member of the population with a number and randomly selcting in various ways Stratified false Simple Random true Multistage false Convenience false Single a sampling that is done by combining the different basic sampling techniques Stratified false Parameter false Multistage true Convenience false Single a sampling that uses samples that are easily obtained or readily available Stratified false Parameter false Sample false Convenience true Single a sampling that is done by dividing the population into subgroups with common homogeneous characteristics Stratified true Parameter false Sample false Clustered false Single statistical measures obtained from data values gathered from a population Systematic Random false Parameter true Sample false Clustered false Single