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Random Sampling
Strength: no researcher bias, fair
Weakness: under/over representative sample
Stratified sampling
Strength: subgroups in target population are represented
Weakness: may be unrepresentative & time costly
Opportunity Sampling
Strength: saves time, cost & resources
Weakness: unrepresentative & not ethical
Snowball Sampling
Strength: helpful to find others with rare characteristic
Weakness: time costly, participants may not know others with characteristic
Systematic sampling
Strength: no researcher bias
Weakness: may be under representative of subgroups
Quota Sampling
Strength: subgroups in target population represented
Weakness: may be unrepresentative, time costly
Self selected sampling
Strength: participants willingly take part
Weakness: may not have enough participants who want to take part