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SRS (simple random sample)
a sample in which each set of “n” elements has the same chance of being selected.
Stratified sampling
divide the population into groups then choose an SRS from each group.
Cluster sampling
divide the population into heterogeneous groups then randomly select through SRS.
Systematic sampling
start with a random number and choose every x number.
Multistage Sampling
combination of techniques.
convenience sample
asking individuals who are always available.
Sample volunteers
a large group of people is invited to respond, and those who choose to respond are counted.
Sample Conveniently
includes individuals who are convenient to sample.
Undercoverage
some portion of the population that is not in the sample.
Non response bias
not receiving responses from everyone surveyed.
Response bias
the tendency of respondents to tailor their responses to please the interviewer or provide inaccurate information.
Wording bias
the wording of the questions can influence the response.
Note 
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