Sampling Methods

Strengths of a random sample

Free from researcher effects

as they can’t chose people that would definitely prove their hypothesis

Limitations of a random sample

• Time consuming

• Possible to end up with a similar group of people

Strengths of a systematic sample

• Avoids researcher bias

• Fairly representative

Limitations of a systematic sample

• Possible to end up with a similar group of people

Strengths of stratified sample

• avoids researcher bias

as people are subdivided into strata

Limitations of stratified sample

• not a complete representation of the target audience

What are some strengths of an opportunity sample

• convenient

• cheaper

• saves time

What are limitations of an opportunity sample

• unrepresentative

• researcher bias

Strengths of a volunteer sample

• minimal effort

Limitations of a volunteer sample

• volunteer bias