CRJ 101 chap 6

The most carefully selected sample is almost always a perfect representation of the population

Range of sample statistics obtained from a selection of many samples.

Some degree of sampling error always exists.

Identifying a single subject or group of subjects and asking the subject(s) to identify others

likelihood that any given element will be selected is not known.

The chief criterion of a sample’s quality is the degree to which it is representative

Snowball samples are most commonly used in experimental research

Nonprobability sampling methods are less representative and reliable than probability sampling

each member of a population has a known chance or probability of being selected

Simple random sampling is seldom used in practice