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Types of samples

NONPROBABILITY PROBABILITY

Haphazard: Select anyone who Simple: Select people based

is convenient on a true random procedure

Quota: Select anyone in pre- Systematic: Select every Kth

determined groups person (quasi-random)

Snowball: Select people connected Stratified: Randomly select

to one another people in predetermined

groups

Purposive: Select anyone in a Cluster: Take multistage

hard-to-find target population random samples in each of

several levels

(Neuman, 1994, p. 197)