graded A+
sampling
selecting a relatively small number of elements from a larger defined group of elements and
expecting the info from the small group will provide accurate judgements about the larger
group
Central Limit Theory
why we believe sampling works; describes the theoretical characteristics of the sample
population
population
an indentifiable group of elements of interest to the researcher and pertinent to the info
problem; more brand
Defined target population
The more specific, complete set of elements identified for investigation; set of parameters
sampling units
Individual units within a defined target population
, sampling frame
the list of all sampling units accessible for selection during the sampling process
probability
each sampling unit in the defined target population has a known probability of being selected
for the sample
nonprobabilty
sampling designs in which the probability of being selected is unknown
simple random sampling
procedure which every sampling unit has a known and equal chance of being selected
systematic random sampling
the defined target population is ordered in some way, usually in the form of a customer list,
taxpayer roll, or membership roster, and selected systematically
stratified random sampling
separation of the target population into different groups, called strata, and the selection of
samples from each stratum