psychology - Sampling

Sampling.

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opportunity sample

taking a sample from people who are available at the time the study is carried out and fit the criteria you are looking for.

Strengths.-
easy method, quick to carry out.

Weaknesses.
Can be biased as your are only using a small part of the target population. 

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Self selected sample

Self selected sampling consists of participants becoming part of a study because they volunteer to take part e.g. in response to an advert.

Strengths.
-access to a variety of people/participants.

Weaknesses.
-Biased, participants WANT to do, may be well motivated people. 
-people may want a reward.

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Random sampling

The sampling technique which is defined as a sample in which every member of the target population has an equal chance of being chosen. e.g. choosing names from a hat.

Strengths.
-Unbiased, all participants have an equal chance of selection.

Weaknesses.
-hard to carry out.
-some people may refuse to take part affecting validity. 

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